Are you saying that you can not go nose left in flight or that the tail rotor does not spin when giving nose left command? My MCPS tail rotor starts spinning when in Stunt 1 or 2 and yes a touch of left rudder stops it. It does not do that in normal/stability mode. I think the MCPS just uses...
Hitec X2 AC Plus
X2 AC Plus 2 Port AC/DC Multi-Charger | HITEC RCD USA
All types, 1S-6S Lipo, comes with AC/DC power cords, several charge leads and 2 balance adapters. Around $100
100Watts each port when on DC, 100 Watts split when on AC though.