@ klickitat jim - What is your typical BU/GU on your IPAs? Do you use that ratio to track the movement of the bitterness up or down, or do you just add hops until it tastes right? Mine are right around 1.200-ish (BeerSmith using Tinseth) and while I personally think that's pretty high, I could still see a little more bitterness as being welcome in my IPAs.
If you have a BU:GU ratio that high and your still looking for a little more bitterness you could try bumping your sulfate up way way high. like 250-300ppm
THIS^^^^ Try it the easy empirical way to see if you like it...add 1-2 tsp. of gypsum to the kettle.
Or you can even dose the beer with gypsum in the glass to experiment with levels.