Inconsistent rev rate will affect length somewhat, backend reaction and carry bigtime. For example, you throw one 350 rpm and strike dead flush. Next shot, 300rpm, you should see some increase in length, but the biggest difference will be in backend and carry. Ball will not flip as hard and will hit flatter. On the flip side, if you grab it and get 400 rpm, length will be slightly shorter, but backend much jumpier, resulting in high hits. Keep in mind two factors: Lane conditions and type of rev rate: Maximum side roll(Axis tilt), or up the back more. Also,if lanes are very oily, varying rev rates will have greater effect than drier lanes. Hope this helps
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If you blame the lane conditions for your bad scores, then you had better thank them for your good ones!!