I was having a hard time liking my ZR40 until last night. Hadn't relly found a condition/line that would let me score well, but finally did.
Sometimes we just try to make a ball play the wrong line for the condition. Not saying that's what you're doing, but I started stringing strikes and went "OH!!! this is why people like this ball!" I'm sure the Sniper would work well for you on some patern with some line, but it might not happen on your home lane. I'd give it a little more time/expirementation...Don't try to make a ball play a certain way. There is always a good scoring line on most house shots, the trick is finding which balls play which areas better for maximum scoring.
I have been able to score well on a variety of conditions with my Pure Energy and my High Energy both polished and OOB. If you really want another ball I would consider both of those. They both cover about the same amount of boards on most conditions (Pure just a couple more) and I've never thrown either past break point except when the High was polished.
Anyways good luck...I'm in the same boat average-wise as you are, but feel like I should be around 200 every night. I averaged over 200 thru January and beginning of Feb, but when into a mini funk where I kept pulling and trying to tweak everything on my approach instead of just throwing the ball. I finally got out and chucked a 638 with a 255 the first game (with an open and 10 X's).
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Kyle: Chef, we need Butters to gain about 50 pounds, fast.
Chef: Well, if you want him to get really fat as fast as possible, one of you will have to marry him.
Stan: Marry him?
Chef: It definitely worked for every woman I've ever met.