Another point - I really would expect some good help from Kris, he's run multiple 300XSs that I know of including a twin rig on a condor cabin model. Out of interest, why didn't you go for the 7.8m vmax which is rated for the 300xs, or if length is a restriction for you ask Mikey1B to make you one in the middle like the latest demo model?
I really think that if the engine is actually 12.5 cms above at minimum height on the jack then that is where your issues lie.
Originally Posted by Downhilldai
I was going to suggest running it without the jack to see if a decent set-up can be found.
DHD is right!