Opening Throttle lacking power slightly

[grant3779]

First post...easy...

I have a Ducati 1098 and when accelerating in lower gears it seems to be less powerful than it used to be. Noticeable when taking off from a stop too. No longer get that "front wheel up" feeling. Once I get on the open road, and above a certain speed, it seems better, but it's just getting to these high speeds is now taking longer than it should and feels like it is being held back ever so slightly.
I changed the plugs and also run some fuel system cleaner through it but doesn't seem to have made a difference. Apart from this, bike is running fine. It's all original, with termi slip on, correct ECU. Nothing else done to it.

I read about possible vacuum leak could be a cause, but not to sure how I could test/look to see if this is the case. Nearest dealer is a good couple of hundred miles away so would like to try/test all I can before I go down that route. Would a clogged fuel filter cause this or would that cause other issues? It's NOT spluttering/backfiring/popping. There is just something holding it back from that all initial burst of speed when I open it up and I know it wasn't like that when I first got it.
Any Input appreciated
Cheers

[CaNsA]

[Cronik]

Check valve clearances.
____________________
*A Vacuous Vacancy*

[grant3779]

[P.]