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I asked if you were using side terminals. optima redtops are rated at 800 ccw. the problem is (and they'll deny it) the side terminals don't provide 800 ccw. after awhile, the starter will start cranking slower and slower, even with the battery charged full. it's easy to check with a digital battery analyzer. every one I've checked has been down between 200-400 ccw off the side posts, while perfectly fine on the top posts. a friend in Kentucky I told about this, who is a mechanic, started checking every red top he saw, and found the same thing. none give 800 ccw off the sides, and if they're close, it won't last long at all.
I had a similar issue to what you're describing at the wf's in 2004. made several t&t passes, boat ran perfect. first qualifying run, ran a .001 to be #1 qualifier out of 28 boats. after that, boat started falling on it's butt as soon as I left the rope. would run, but like crap. we chased that all day, and even next morning (I had a bye). msd was there with their big trailer, we got the rep to come over (we had replaced about everything except the box). still screwing with it, one of my guys grabbed the positive connection at the battery, and he could move it. the thing was, as long as the water was perfectly flat, boat ran great. with a little chop, just enough bumps in the road to make the thing move. and that was all it took. tightened the crap out of it, ran the rest of the day on sunday. the power supply and ground has to be very tightly connected to the battery. otherwise issues come up. had another little issue at the last wf's, and that was the first place I looked. and guess what, the positive cable was loose in the terminal at the battery. I don't mean loose like it's ready to fall off, but loose like it takes a little force but you can move it. stuff has to be clean and very tight. that you were able to come back the next morning and get a clean pass tells me it's an electrical connection somewhere.