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I have a party of six level 9 characters that probably do about 100 DPR (probability weighted).  this was based on fully estimating actual DPR at level 7 and swagging the increases since then, but its fairly close.  Most of the party is melee, so there are limited focus fire opportunities, and as such encounters tend to run long.  The players are pretty happy taking skill focus feats over damage feats, and making similar non-charop tradeoffs, even when presented with suggestions on how to tweak their DPR.

I'm going to try the doubling damage and halving hitpoints thing, but I kind of wonder if there is some other mechanical shift I should make.  Obviously a party of three cleric|rangers and three lazylords would do double the damage my guys could drop - should there be a different gearing on encounter toughness?  I don't want to reduce the exp / session.  I've tried to move to having half of total exp come from non-combat, but I want to target having encounters that last ~5 rounds, and with six PCs at level 9 800 HP is not unusual...

thanks 

Thanks for the ideas.  I'll try halving hitpoints and doubling damage, and then try swapping out half the standards for minions.  I won't do both at once!

.  I want to try to stick with the same XP budget, and avoid technically softening the encounters, but I do want to try to get to a 5 round mean encounter, and 800 hit point encounters with 100 DPR is a recipe for boredom.  These guys have been playing the characters since level 1, so I don't think party synergies will change unless they find some new strategies in Paragon (always possible).

Just use lower level monsters/encounters.

The DMG classification was meant for optimised Parties. So if the Party is non optimised, consider how long you want the fight to last, and adjust accordingly.

Math-wise (boring...),
at 100 DPR Probability-adjusted, and assuming you don't want combat to last over 6 rounds, you can use 500 HP as a measurement (ie 5 rounds, with 1 round leeway for divided fire and other things that result in Players not attacking)
With 6 Party members, each Standard Monster should have about 83 HP. That comes to about a Lv 7 Standard Monster.

You can try using Lv 9 Brutes with somewhat lower NAD defenses and about 100 HP. The damage is high to keep the threat, but the defenses are low.
1-2 Artillery / Lurkers are also a good option, as they have Low HP. Artillery may be difficult to reach for a Melee heavy party though, and their poor Optimisation probably means the Artillery will be hitting often. And if you don't attack with them to try to avoid a TPK, well, it seems weird.
If you want to moderate the flow of the game so as to prevent unexpected TPKs, Lurkers might be better. Stick to Melee Lurkers so your Party has the chance to get rid of them. Be prepared for swingy combat though, as Brutes lay out high damage and Lurkers can do so as well.
Most Lurkers have a "disappear until 1 round later" so you can use those mechanisms to prevent the Lurkers from attacking every round. They are also very handy to end Grind, as usually after most of the other Monsters are dead, Lurkers should simply run away.

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Without turning to Minions since someone already suggested that, here are some house-rule possibilities.

a) Run with Lv 9-10 Monsters, reduce all their Defenses by 2 and their HP by 2 per Level (ie 18). Award XP normally

b) Select a Damage threshold. You are a hardworking enough DM to get 100 DPR I guess, so aim for a high damage value that a Striker has about 25% of attaining. Run with Lv 9-10 Mooks (Creatures with normal Defenses) that have that number of HP, so 1 hit from a non-Striker bloodies it, and a Striker has a 20-30% chance of killing it outright.
Each Mook has an XP Budget equal to HALF that of a Standard monster.
If you wish to keep threat high, each Mook should do the normal amount of damage for a Standard Monster. This means the fight is more dangerous at the beginning but easier later on, as all of them hit hard and there are many of them.
If you wish to keep threat moderate, each Mook does about 20-30% less damage than a Standard Creature. At Level 9 that translates to roughly 4-5 less points of damage per Hit.
You can use the Low Dmg expression in this incredibly useful DM Sheet : slyflourish.com/master_dm_sheet.pdf

For the house-rule possibilities, try out at Level 9-10 first, if the play goes smoothly you can gradually increase the Level.

Hope this helps.