Well, after farting around and spending countless hours of wasted time trying to sort out the tail on V3.... I have finally found the answer to my problems. Strange thing as it is, on the 700E when I had it on there, I had no problems whatsoever..
Tail on the 450 sport though would just not hold at all in any backwards manoeuvres. Thought it could have been Motor problem.. so new motor, and still no joy. Changed the esc and still problem there. Thought maybe all my lipos have just got really bad.. new lipos and still there.
....finally flashed it back the V2.1, and problems are all gone and tail is holding good again!
Tail on the 450 sport though would just not hold at all in any backwards manoeuvres. Thought it could have been Motor problem.. so new motor, and still no joy. Changed the esc and still problem there. Thought maybe all my lipos have just got really bad.. new lipos and still there.
....finally flashed it back the V2.1, and problems are all gone and tail is holding good again!

E.G.S.