Thanks for the advice all. Personally I don't feel with a set of 10/12inch adjustables I can tighten that size fitting properly unless using a bar on the handle.
The job I'm on are moaning about the marks the stilsons leave on the fittings even though non of it is in show.
how many 35mm+ comp fittings do you have? Normally if we have to put say a lever valve on 35mm tube we would get 35mm to 1 1/4" end feed or press irons and use a screwed valve, bit more secure than compression, obviously has the disadvantage of being harder to take off depending on location but its easier to wind it on rather than doing up comp nuts.