My living room is open, L-Shaped and is 14x20x8

I bought the Avia Disk and used the good old RS SPL meter. Using Avia, my sub should be at -17 and I run it at -20. That is why I'm considering either a new amp or the m80's.

So, if I were to buy an Amp, wouldn't it make the m60's louder?

Receiver: Yamaha RX-V2200
Main: Axiom m80
CC: Axiom VP150
Surround: Axiom QS8
Sub: SVS PC13-Ultra