You do not need a new amp. The JR is a very capable and good sounding amp, no matter how old it is, but as you've been blowing drive units, that may be the whole cause of your 'problem'. The JR will easily drive the WP to loud levels (btw, you've been asked a few times about your hearing - do you have hearing issues?). As somone else has said - if blowing tweeters, it's usually a clipping amp issue - it DOES NOT mean the amp is too powerful - but it may mean the amp is faulty, given your house power issues. If you keep on blowing tweeters, you cannot blame SF for not wanting to continue to supply them to you if it's your own fault that they're blowing.
You also don't mention the size of your room, as a very large room will make any amp work harder, and 'L' shaped room are awful for sound stage creation.
Finally - keep your kids away from your system and get them their own.