I found this and I let it bed in for 400 miles then slackened the bolt and retorqued it and now I only get a vibration in reverse when manoeuvring which is normal.
If the bolt is too tight it will be worse so make sure it's torqued to the correct torque which I posted earlier in this thread.
It will bed in though
Thanks, will give it a chance then, yeah torqued to 74lbft (100nm).