Charlie,
11.5 is no where near fat... especially on a Buick. Most of the engine tuners I know off typically will tune a Buick at 10.8-11.0 on Race Gas. 11.5 is what most Supercharged cars get tuned too.. and thats not fat by any means.
So once you have your baseline tuned at 11.5, then change your target to 10.6. Take out 15% out of the VE table at the 15 PSI mark. Leave your correction on at +25,-5 and proceed to tune it. And make sure you stay in gear long enough to not allow other corrections like accell enrichment, coolant, etc.. from playing a role.
Dial it in.. so it does no correction at 10.6 at 15 PSI. Then based on what you see on your VE tables, you can interpolate what the numbers will be above it in the VE. Example you have 55-60 VE at 15 PSI boost. At 20 PSI you'll be at 58-63. At 25 PSI you'll be at 63-68. These are all examples.
So do you turn the correction off.. No. You need to move the target that tells it where you want to go.. and fix the VE table.
Piece of cake :biggrin: