,for the lengths of tubing we're talking about,
Fixed that for you

Your G1/4 fitting will have a through bore of no more than about 10mm so those are going to be your restriction for any tubing over 10mm ID. Larger bore tubing would have a lower 'resistance' but over the lengths we're talking about, I suspect it's negligible. Personally I try to stay at 10mm ID as a minimum so I don't further restrict it more than necessary. But you've already got the 'right' idea and gone hard tubing....can't go making life easier than necessary for yourself!