Make sure you have the top of the spi very close to the spi gate at the mast. You don't want to have the top dangling on a piece of 20 inch long line there. Adjust all the rest to that, UNLESS this screws up you sheeting angle, then you must reposition your mast gate itself. Although altnatively you could also reposition the last block on the sheet line to get the right sheeting angle.

Wouter