I have Yamaha v685
95 watts per channel.
I am thinking about around 150 watts to get better clarity.
55 watts isn't gonna give you more clarity, but it'll give you teensy bit more max volume. You have to double your power just to gain 3 dB so that's kinda my rule of thumb. If you're gonna do it, double what you have now or there isn't much gained. Did you check out that spl calculator I linked?
Besides, you're barking up the wrong tree if you're looking for more clarity unless you need it at extreme volumes. Your speakers, source and room are what's in charge there. How far do you sit, and how's your speaker placement? Did you run ypao or try using tone controls? Experiment with toe in? All of that stuff has a big impact on how your speakers are gonna sound. Unless you're maxing your volume out now, your speakers will still sound the same with a more powerful amp. There will just be more power on reserve, not being used at all.