hi all,
it sounds to me that your lipo may be getting a bit past its best, i have all my cut off's set to 3.4v per cell and my 5600mah packs take 5747mah when charged , my 5300 packs take 5390 , if you have a 5000 that only takes 4000 after being discharged to 6.6v and cant even deliver 6.6 at the current your set up wants then, its a sign that its time for new packs , turnigy and gens ace both offer great value and consistant performance, the gens ace offer a smidgen more voltage under lab testing but oddly the turnigy feels like it has more punch!
all the best
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