cheers guys , I have noticed the original has about 100mm of continual support at the aft end whereas the cs has a lot more removed , gonna have a tinker like you do and see what happens first is to get a bit more support at this point , looking what KC has mentioned look like it may well benefit .
Fair bit of rough wood in there now sanded flat . don't suppose that was helping keeping things stable
FTP900 MTC connect,Welhamanium internals -sorted
HFT500, ACZ stock MTC connect
TX200 Mk3 CS1000 stock, hawke vantage sf , Nick G internals
Steyr ?, maybe , they cant all be wrong?