It's a setup situation which requires some tuning over time. Could be a combination of things.....try....
Ask some other sailors there opinions.
Move your back footstraps all the way forward and see if there's any front foot pressure.
Lower your boom height lower again moves pressure towards your front foot.
It could be that you've set your sail to flat through to much outhaul and or to much downhaul.

It's a centre of effort issue which includes many variables. Try one thing at a time.

Have fun:-)

Hi Magnus8,
No the clew isn't dragging in the water and the back strap is in it's most forward setting, the boom 170cm{just above my shoulders}.
I have never encounter this till getting Startboards, not saying its the board.
Thanks for your help.

Jas71 said..

Hi Magnus8,
No the clew isn't dragging in the water and the back strap is in it's most forward setting, the boom 170cm{just above my shoulders}.
I have never encounter this till getting Startboards, not saying its the board.
Thanks for your help.

Had the same problem with all Starboards so I switched brands. Try Toms mod on the Mt Best site if after changing everything you still carn,t get it right. Works very well without drilling that extra hole

Jas71 said..

Hi Magnus8,
No the clew isn't dragging in the water and the back strap is in it's most forward setting, the boom 170cm{just above my shoulders}.
I have never encounter this till getting Startboards, not saying its the board.
Thanks for your help.

Sounds like your harness lines are in the right spot then.

Place your mast base in the center position on the 107 and 133 as indicated on each board.

Plug in your sail and bring together with your board on land.

You will most likely notice that the boom goes way past the back of the board.

Now adjust so that the gap is no bigger than 2 fingers wide.

Then go sailing, enjoy.

I have been in the garage looking at rigs on boards and mast placement. Have also moved the back strap all the way back. Tomorrow i will see the outcome and let you know.
Froude in using a 46 pointer

Thanks for the help everybody.

Jas71, I experienced the exact issue's with my previous futura111 and isonic107. Strangely, less so with the Isonic like you but still to some degree. I found lowering the boom made the largest improvement. It does sound like you have your boom high - I know I did and was reluctant to bring mine down. I would try that first and see how it goes. I also adjusted my rear strap centre holes and front furthest back, all out board of course. Slightly narrower spacing felt better for me.