[redshift]

In my exp there is no loss of punch at a lower charge rate. Before i got my Duo2 I used a buddy's Polycharge 4 that had a 3 amp max rate, and I am getting the same punch out of my packs charging them at 6-8 amps now.

"all the cells are unbalanced again"

How much out of balance?

If it's a lot then one cell will always be working harder and will of course make the pack weaker overall... but if it's not much then probably no worries other than shortening the lifespan of the pack.