Do this.
Or even potentially, get you existing cab closer to being in line with your ears. If you need more volume for FOH then maybe not, but if your amp is prety much just for on stage, then you probably have enough volume already, its just not directed at you adequately. It's advice I got decades ago and it still stands up today!
I've no scientific evidence to back this up, but I think thats why 8x10s tend to sound brilliant... there's speakers in pretty much ear height so you're hearing the amp better. 2 2x10s stacked vertically, or a single vertical 2x10 raised to ear heigh does the same job, kind of.