Using balance to compensate for speaker distance

Hi.

I recently installed a couple of shelves in my room to hold my Paradigm Atom monitors. They're on a wall perpendicular to the amp, which means that the speaker cable to one monitor is longer than to the other (I know that ideally, they're equal lengths, but for that to happen I'd have to buy more...). One speaker is also a bit further away than the other. Is it ok to use the amp balance to correct for this? And while I'm at it, is it ok to connect two speaker wires using butt connectors?

Any responses would be greatly appreciated