What prop do you have on hand and what connectors are you using ?
You should be running 5.5 bullets all the way in the setup.
I would try a three blade it should help control with torque roll in that hull,
Some props that I would try are a x646/3 and a x447/3 and so on.
Do some test runs for 1 1/2 minutes and check temps on everything and motor connectors to,
Also if you have a gps get some speed readings to.
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