You don't answer people's questions, how long are you running for to get your voltage down to 6 volts?
The whole advantage of lipo is a more consistent power output, I do notice a difference in second 5 minute heat from a non topped up pack but it's not as noticeable in lap times just the feel as you pull out of a slow corner.
ESC may not be cheap but technology moves on fast, I too set LVC at 3.4 as I look after my cells and don't like to stress them too much!!
Just for info I use Xerun V2.1 ESC and Turnigy 5300mah 50c packs so cheap really
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