Mine have/had a luff of 28' 4", and I ran it on a TheMightyHobie18 with a 12.5' pole, I ran it all the way to the masthead (added running backstays). It was really way too much sail for that boat, but I sure had a great time! When I ran it on the SC20 (one season), it was with a 14' 4" pole and the hlyd was attached about 3' above the hounds (about a third of the distance between the hounds and the top of the mast), and it just barely fit. Worked quite well, though I never liked having all that windage out there in over 15 kts. Dropped it onto the tramp a couple of times when the wind piped up or the furling fouled up , but that really cluttered up the deck. The spin and snuffer set up is noticeably less windage.
The hooter is now with Flight Risk, wintering in MT, so I can't measure the foot. Both hooters from Smythe and Calvert, were mylar sails that held up pretty well, though I'm sure they have a limited lifespan. The material is happiest when it is furled cleanly , and doesn't like it when it rolls up unevenly (when it's flogging), or when the sail is taken down furled and wrinkled to handle it. Longest life would be if it could remain furled on the boat all the time. I sewed up snorkle cover out of Sunbrella and had a small 1/8" halyd to pull it up when I put the boat to bed.
Both had/have Harken small screecher furlers, and because of the large size of these sail relative to the furler size, I needed to maintain tension on the furling line (3/16") as the sail was being deployed, or the line would enter the drum sloppily and jam up before the sail was completely unfurled. On FR I've got a tapered furling line, so the dia of the line on the drum is less than 1/8", which has reduced theproblem substantially.
I think you're best advised to mock up a pole and temporary hlyd blk and take an actual measurement for your luff length. Remember to allow for the swivel and drum heights. This measurement will be very dependent on how high the pole tip is when under tension. And I set up a 2 to 1 purchase system for the hlyd to get enough luff tension.
Feel free to call me if you wish.

Davem 509 276 6355