Leaving the paper on adds weight, anytime you can remove the paper on DTF and use other methods like sanding first to reduce the profile of the open score line then fill with either scrap foam or very light filler, your plane will end up much lighter and should fly better. I take all the foam off my fuselages when building with DTF and in the one plane I built entirely of DTF also removed it from the score and fold intakes. You can then reinforce areas in the intakes with small amounts of tape, fiberglass drywall tape and glue spread thin, etc to give it durability.
Personally when building with DTF I try to build lighter and remove the paper wherever I can. I would rather have a plane that flies better than looks better.
yea i use scrap foam and sanding to fill in crevices as i like a nice smooth airframe
what treatments /reinforcing to you put on the paperless DTF portions?