So ive been playing around with the Intel XTU(Extreme Tuning Ulitility) and trying to nail down my speed issue. Ive managed to come up with a couple of hypothesis.
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When i unplug the charger, the cpu when enter a thermal throttle state every so briefly. whats interesting is that AIDA64 reports no thermal throttling but you can see spikes in CPU usage as the clock speeds bottoms out. I suspect this might be the cause of the issue as its tricking the system into thinking its overheating.
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Windows Power management being strange. I can force the CPU to upclock again by forcing it into 100% cpu speed in the power settings.
Need more time to test it out more thoroughly and see if i can find anything else out before coming to any kind of conclusion