I have to agree with you Grant.
I have IB4200 side by side six packs and a few other 4000 packs.
I generally charge them in the evening at 2A then let them sit on 500mA for 1/2 an hour to help balance the cells.
In the morning before going to the pond I give them a burst of 4A max, this gets them warm and ready for some speed.
None of my setups will make the packs hot after a run, warm is good, hot is bad.

To me warm is like the outside of a coffee mug, hot is like the inside !!
Note. This comparison is based on a normal ceramic or glass mug not my big thermal ones, the mug must be full and the coffee fresh.
Actually I am off to have one now.