HI Matthew
no one I know of has does an under tramp set up on a Mossie.

The mossie tramp and I would presume cobra tramps are a lot closer to the water than Vipers a lot less free board with the mossie.

We run 12:1 internal on the mossie so my crew can still pull it on when it gets windy.

"Sixth Element"
1782 MK2 w/spinnaker.
Lake Bonney Y.C.
National Sec. / S.A President / S.A Measurer / Commodore LBYC