Redo your gyro/tail setup.
I don't know if you have the new or old version of the gyro but in the new version you can get full slider pitch and a rate mode hover as well. The directions that came with the gyro should be followed.
Really though even with a poorly setup gyro the tail should hold. What is your headspeed? Motor pinion and throttle curve?
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Trex 450 Pro 3xDS410M + MKS8910A+, Align FBL head w/Microbeast, CC 45 Gov@ 3400rpm(max timing, outrunner mode), Scorpion 2221-8 on 14t, Edge FBL main and tail, CF boom, CC BEC @ 6V
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