He might be right, However, when you're running boost, even 3 degrees can affect a lot of horsepower. I've seen horsepower numbers jump 5+ horsepower with just 1 degree of timing adjustment. It's a little challenging for you since you have to keep sending your ECU back and forth, but you can't be too careful with a Stage III SC Gear kit. You're in unchartered waters.
I don't know how you scored an H2R fuel pump but great job! Also, I like your approach of leaving the rev limiter in the 13k range. Very smart. I wouldn't chase peak HP at high RPM with these things. There are no true long term tests out their yet.
Not sure that SC gears are going to be safer long term on the motor than a 14k rev limit, it might (or might not) be the other way around. Think we have more true testing on these motors at 14k then with super charger gears, not just all the people running Brocks Stage II set up but Kawasaki obviously did gear testing & there has to be a reason they went that direction (higher rev limit) w/ the H2R vs. the H2 over changing the H2R's SC gears.
And with 14k it's something you can control, how often &/or how long you are between 13k & 14k. For me over 8k & I use the added 1k rpms but it'll be a quite a while till 30 hours/ to service intervals similar to the H2R. I shift above 13k when I need or want it, versus say with SC gears w/ out (or even w/) an intercooler & maybe constant higher inlet temps which are there constantly & can't be controlled when going hard up the rev range on a street bike that's ridden thousands of miles each year, which based on the additional power it's producing constantly across the rev range from all rpms up to 13k might require (speculating) an even more accelerated maintenance schedule than a Stage II H2 w/ out gears & a 14K rev limit.
But I get that it's different strokes for different folks,,, for what they prefer, that's perfectly ok too & find your bike & Racer172's build really, really interesting .... For my preference/use with 5-10k street miles, often thousands of miles in 85F + summer temps plus a couple of track days a year I'd rather have a bike that runs cooler w/ a 14k rev limit & more power at the top of the rev band when I want to use it for high mph straights then chase more power lower in the revs w/ SC gears.