You only need to change the TruBoost to allow for the higher boost level and then tune for the higher boost level. The F/IC will not need to change to a different map. If you are running 10 lbs and the tune is done, running anything under 10 lbs should be covered by the 10lb tune as you have to go through all the other pressure levels to get to 10lbs. Having said that the key is to have the tune be complete meaning that every possible cell that the car will populate at every boost level has been tuned. There will be cells you hit with a 6lb tune that you will not hit with a 10lb tune.
Once the car is tuned for the highest peak boost you will be running dropping the boost with the TruBoost should not require any MAP changes in the F/IC. You can change to a second map but unless you are changing something other than peak boost there is no need to change to the second map. One reason to use the second map would be for a meth tune and a non-meth tune. In this case the meth will allow for a greatly increased timing table over the fuel only tune and in this case to take advantage of the meth you would want a second tune to lean out the fuel and add timing.
Your best bet will be to have the tune done on a load based dyno and it will take time to hit and setup all the cells in the map.
I run two different spings in my twin turbo setup and I do not have to switch anything other than the springs to change boost levels the F/IC map is unchanged but tuned for both peak boost levels. As part of my tuning process i started with the least amount of boost, tuned the car, moved to the next spring and next highest boost level, tuned the car. I continued this process untill all the cells that the car would hit in the fuel map were tuned. Now my map is good for whatever spring I intend to put in. You can do the same with the boost controller starting at the least amount of boost and moving through the boost levels untill you reach the peak level you want to run. Then any level below that peak is tuned and safe to run.
As this is all WOT tuning on a dyno it should not take very long maybe 2-3 pulls at each boost level to dial in the tune for each boost level.
Post up some dyno sheets when you are done, you are going a lot higher than I would go on my stock bottom 3.2l but then again I am not running meth.