On off throttle chain slack issues, possibly throttle cable ?!

[Tubz1983]

Ok so I fitted a brand new chain set (extra tooth on the front sprocket) and I've adjusted it a couple of times over the past few months, however recently I've really felt that slack feeling u get, like a chain whip almost, when on and off the throttle (almost seesaw like) obviously I figured it was the chain again, tightened it up to acceptable levels (not guitar string tight but not flappy either). I still have the same issue?!! Any ideas of it could be something else ?
Thanks as always
Toby

[darrsi]

35mm slack in the middle of the lower part of the chain is the correct setting.
More subtle use of the clutch would probably help too, but other than that i'd say it's all pretty normal. 

[Tubz1983]

Yes perhaps in a little rough with the clutch possibly, il double check the chain tonite. Thanx