I would personally grab a Much More Racing Cell Master. I'm not sure about the newer lipo version of the orion advantage, but I remember thre original one having a pretty non linear charge current. It would fluctuate pretty easily. The Cell Master is realllllllly linear, and gives a better overall charge. I personally dont like the menu's int he advantage charger either.... The cell master is pretty easy.
I've been using mine along with their heatsink and warming tray and it's been working awesome for me. I use the heatsink during charging because it equalizes cel temperature while charging, then if I peak to early before a race I drop the battery into the warming tray. It seems like the internal resistance int he battery is almost directly related to the temperature of the battery. They need to be warm if you want some rip out of it.
-Korey