I would be inclined to biamp them as long as you get good bass response from the woofers with "just" 150 watts. With bass it's not just the power but also damping factor. I tried 200 watters on RM40s which gave wooly bass but I don't know on the 30s. Biamping insulates the mid/treble from being affected by big bass induced power draw, but try them and listen for yourself -- always the best approach if doable.

edit. Welcome to AC.