Did you get the response or power version of the RSX?
I have recently bought and installed a High Voltage servo in my 1/10th. The RSX-power was my first choice on spec's but it was a bit over my budget so I settled on a Spektrum S6100 which has slightly less torque. I have wired it direct from lipo as you are thinking of doing and it works well. Rather than cut the servo wires I removed the red terminal from the plug and have connected this to a male terminal from a Y lead soldered into the lead between batt and esc, this way the servo or esc can be removed easily without soldering.
hth
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