Holeshot on pops rig aint too hot. It's not underpowered by any means. The 115 is just having a hard time getting a grip. He has a kicker and 3 batteries in the back, but the fuel is centrally located.

My boat only has a 90, with 27 gallons in the back and would jump plane very quick.

He has a 8 inch jack plate. Does the extra 8 inches mechanically added that much weight? Maybe he needs a 4 blade prop?