Actually, I'm playing right now, and the problem may not be accuracy so much as projectiles don't land. It's like there are more projectiles coming down than there are ones landing anywhere. It's like half or more of them make no difference and do nothing. Maybe bullet speed doesn't affect accuracy so much as outpace impacts or the rate of impact. Maybe with slower bullet speed, more bullets actually hit targets. And with higher bullet speed, some or most impacts are "skipped". It's a real problem and reduces the effectiveness and enjoyability of the game. I hope this helps, as this game is actually quite addicting. It would be much more addicting if upgrades didn't degrade the effectiveness or performance of the gameplay, though.