Ok,

I have been using the Nite Site Viper on my MTC for the last 7 month with no issues or dramas.
All i did was cut the tube down to the correct eye relief and before fitting the the scope ensure the eye peice on the scope is fully wound inwards.
I also put a very light smearing of grease on the inside of the tube to aid the fitting and stop any damage from occuring when removing.

I also have the connect on my HW95, again, no issues or dramas with making contact with my eye when firing.
All i do is ensure i have built up my shooting position correctly I.e. ensure the 95 is in the shoulder.