I'm in no way an expert but I really surprised by your figure of only 5% for TR thrust in hover. I would have thought it much more than that for 2 reasons, one being the big difference in max total torque in the hover vs high speed flight (unloaded TR) for the later Super Puma family helis.
I am no expert either, but I would think for a medium twin that number is higher too, but for a small single, 5% is a very probable number for me.