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Help! FT Explorer servo issues with power pack CV2

#1
I recently decided to buy my first plane as the ft explorer with the power pack CV2. It flies fine in 3ch mode, however when I put the 4ch wing on, the servos freak out when I use three at a time. On my transmitter, it shows the receiver voltage drop from the 5 volts to below 2.

After going back to try to troubleshoot, the 35A ESC in the power pack only provides 3 amps to the receiver! Clearly this isn't enough for 4 9gram servos?