you just gotta think, you have 3 more inches of leverage on the shocks.
stock shocks arent very good to begin with. how much do you weigh?
i was 110lbs when i first got my blaster, and everytime i'd jump it, i'd bottom the back shock and the fronts i never fully had a problem with, other than ride quality. so if your light like me, maybe the extra leverage will soften the ride a little bit and be good as long as your not jumping or anything.
banshee shocks are an upgrade over stock, and a banshee is a heavier quad than the blaster. so the shocks are probably stiffer and will be better.
i have works dual rate shocks, valved for 130lbs rider, and the +3 a arms. they arent high end elka's or fox shocks or anything, but they ride like a dream compared to stock. if you can get lucky and find a set for cheap, i'd snag them up