I always felt that 30' was the limit for schooner type rigs, and maybe too small at that. (Whose design) A yawl or even ketch at 30' was fine. I have a set of plans for a Jay Benford ketch rigged Dory at 26'. H-28 is to me one of the perfect boats.
My sail boat jobs were only two. Both Ferro-cement and both very succesful. A 60' Samson schooner and a 24' Benford Gaff rigged sloop. The rest of my commercial work was off shore fishers in steel, 32' to 110' long mostly combination draggers and trollers. But I also got 4 yachts in the bunch two 65' and an 80' based on the old Trumpy designs and one house boat built of a gulf shrimper hull.
Small Boat Journal is still gone. These were all back issues my son was gifted.