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They tend to lose out in the mid range with cams, the inlet was designed for a standard engine.
I have 197 cams and MWM custom timing, it does pull at the top end better and gain a few bhp but it also loses 10lbft in the midrange vs RS2+ standard cams.
It needs a proper drop test not just the voltage testing ideally.
It could be on its last legs and the cold weather has highlighted this? I think mine is an original battery and it let me down last winter (at the pub after the chester meet when I left my lights on!) so 9years is a fair...