[DG] [TG11] RV100 Axion 9 loosing bottom at speed

[fish for fun]

I have just fitted the axiom 9 with real vision into my boat
I set the transducer up as per instructions taking care to check the lines in my hull to stop any bubble lines forming under transducer
single engine 90 HP Murcury
Rv 100 Transducer mounted on RH side
hull is a whittley sea legend 5
The boat is only a 5 mtr boat but i have had 2 problem while setting it up

1 I loose the bottom if I am traveling at speed. If I am on the plane at low speed reads ok. At high speed it looses bottom
2 if I lower the transducer future into the water the transducer acts like a trim tab and pushers the side of the boat up and now has become very uncomfortable to ride in the boat

Any help would be appreciated to work through the problem