Added+
I've continued researching not wanting to spend that much and get it wrong for my needs. Asking on a flight forum I was told you can download the Revolectrix CCS software versions for the chargers in question to see what features they have. I found that both PL6 & 8 have Voltage adjust 3.0-4.3v by .005 steps, Data graphs and IR testing. So does the 10XP but to be confirmed only 4.1, 4.2 and 4.22v choice?
I've also asked if the iCharger 306B and 3010B while balance charging add more current to behind cells or pause/discharge high cells?