I am considering moving up to outlaw 970+outlaw 125X7wpc separates from an Harman Kardon AVR630 rated 75wpc is it worthwhile to do so ?

My setup includes A pair of ST3 towers front, SS Dipoles sides, and either SBL bookshelves or ST2 towers for the rear plus SC center all rated above 90db. The towers are 93-95 sensitivity but I feel the urge to up the base on them and I fear the HK may not hold up. Basically I am wondering if there will be improvent in sound be it soundstage, imaging and lower noise floor, better bass response etc. At the moment the set up sounds great but I do feel bass is a bit lacking and have to adjust tone on receiver. Any opinions?