Thanks for all of the responses, now just to clear up some questions. The BEC output from the RX8 is set to 6V but is rated at 5A so I thought that this should be strong enough. The HW based 1/8th ESC are rated at 3A and have known to have given issues. Maybe ESCs in the future will have adjustable BEC voltage outputs, it seems that with more people using HV servos this would be a good move. I think the problems seen on Tekin ESCs BEC is from the RS range.
To me it almost seems that the receiver is throttling the current throughput possibly with a higher internal resistance.
It's looking like I will either really have to change radio system or servo, and possibly both. Any recommendations for a good servo for 1/8th off road steering?
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