Since everyone has a different opinion here, I'll add mine. I do think you should first try a different amp and see if more power does the trick. But if you decide to move on, I suggest you look at Green Mountain. Coming from Vandersteen as you are, I think it will make for the smoothest transition if you stay with a time- and phase-correct design, of which there are only a few, Green Mountain being one. And their designer, Roy Johnson, likes to play music loud, so I think you may get what you are after even in one of his smaller designs.
Your room appears to be rather small, with the speakers near the side walls. This will be an issue for you with most speakers, some more than others. Just something to be mindful of.
Your room appears to be rather small, with the speakers near the side walls. This will be an issue for you with most speakers, some more than others. Just something to be mindful of.