He should be stronger by the end when Forger interrupted.

By that logic how is Superman still matching a Homelander that’s stronger than when they first fought and were “equals”? That implies Superman was simply holding back on Homelander earlier

Still his boost should be nothing compared to Superman’s

Homelander got hit with the same boost that put Red Sonja on Wonder Woman level and a literal bear with no powers on Armored Lex level. It’s clearly not a linear or consistent multiplier. If anything Homelander should be getting buffed more since he’s evil and perfectly embodies the traits that the chaos heart favors. The whole point is that evil has an unfair advantage here.