The first thing to do is if you have standard wires, you will need a jumper if there is 4 posts and you have 2 wires to connect( plus and minus)
Second, play some music walk around the room. Do you hear boomy bass in some places and none in others. Go to the corners, is it boomy there? If you hear this then you should try moving your speakers around. I point them right at me and sit back the same distance as the speakers sit apart. Some speakers only need to be tilted in slightly.
Third, even if the room is not too bad for acoustics, a sub is a real helper here. Very few speakers go down low enough in the bass. Especially, since you said you liked bass. But you may find once you fix positioning and room problems your speakers are OK. Try sitting a sub right beside a speaker. Point it toward you or the wall. If you have a second sub put it along the wall by you.
Fourth, you are used to the B&W sound so I would not ditch these speakers...yet. Same with the amp. Depends on how loud you like your music. But amp replacement is after you try a sub. A powered sub has it's own amp and bass takes the most power, so your 252 may be enough. Also, less excusion of the woofers reduces distortion of midrange frequencies.
Don't feel bad, they always say build your system around your speakers. :)