5.2v ICP at WOT is either wrong... or something is not right. Unless you have an upgraded HPOP. Most see 4.6-4.8v
I used to run a twin hpop kit and at WOT I could hit 5.1v... but it would surge any time I got above 4.9v. Not enough to see on a monitor but I could datalog it and hear it on the dyno. ICP was getting too high and caused a harmonic surge in my HPO system. It made the truck lose about 150hp.
Basically HPO/ICP would hit 5.1v drop to 3.5v and back up to 5.1v... up and down so fast that I could not see it on a monitor.
My solution was to pull back IPR duty cycle to max out around 75% and max ICP of 4.8