Sleep and Battery issues-- Back to Tiger?

(Half of this relates to a thread of mine called "Dead Battery?"-- I tried all the fixes proposed and it's still unclear if my battery is fine or dead.)
I'm having battery and sleep problems that started after installing Leopard and I'm wondering whether I should:
1) Go back to Tiger and see how things are.
2) Format and install Leopard again (I didn't do that the first time)
3) Do something else.
The details are:
My battery shows 0%, the computer recognizes it's connected to the AC adapter, but "Battery is not charging" shows in the drop down. Coconut says the current charge is 0 of a maximum of 4164mAh (Apple System Profiler agrees with those stats). Yesterday it said my capacity was at 94% of it's original, but I pulled the battery last night to reset the PMU and now it can't give me the original capacity. It also listed 111 loadcycles, but now (post PMU reset) it and profiler say 0 Cycles. My battery was working fine the day before and would give me a few hours of use on a full charge.
My computer has also had issues coming back from sleep. The screen will stay sometimes stay dark, but repeatedly holding the power button will suddenly bring it back. I was using it this morning, closed it for five minutes, and when I came back it would make a noise (the mechanical "HD waking up noise"), give me 4 seconds of my screen, and then the screen would go very dark (but not completely out). If I held the power button I could get 4 more seconds. This repeated until I ctrl-apple-power and it restarted just fine. I've never seen my machine do this before.
I have reset the PRAM and the PMU and tried different power adapters.

I use SoundHound, had no such problem.
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