Joe, have you noticed a difference in speed of pointing ability with the loose footed main on your C-27?
Are the sails cut differently or attached and reinforced differently from one with a bolt rope.
I've had the loose foot main for quite some time... it increased performance dramatically of the old North, attached foot, main it replaced.... but... most of that improvement is the result of a new sail replacing an old, worn out one.. what the loose foot allowed was near instantaneous adjustment to draft depth....easily visible.
If you feel more comfortable with an attached foot, have your sailmaker sew in a "shelf" of lightweight sail cloth to fill the gap between foot and boom...the shelf folds up as the outhaul tension inceases. That said, most sailors find the loose foot more than adequate and are reluctant to spend the extra money for negligent performance increase of the open version.
Attached foot sails, must be cut differently and offer less responsive adjustment. Many attached foot sails were equipped with a "flattening reef" feature.... essentially an additional cringle four to six inches above the clew that required special tackle to constrict the leech more which effectively flattens the lower part of the sail..... not seen too much on modern sails.
As I said in another thread, most modern non racing sails will have a somewhat larger roach, and require full battens in the top two slots.... partial battens in the lower two slots, and a loose foot, will allow one to quickly adjust outhaul..draft depth... and that gives the average sailor like myself a lot more tools for little investment.