I've had essentially both boats
The Hunter 35.5 had the beginnings of the B & R rig but also had a split backstay. The mast is further aft with a smaller main and boom. Mid boom sheeting as well. Because of the smaller main, you can put a genoa on the boat ranging from 135 to a 150 percent head sail. I suspect you could put an even larger sail but I doubt if it would make the boat go faster--I think 150 might be the most effective size.The 376 has a full B & R rig, the spreaders quite a bit aft and the mast is further forward on the boat. The main is very large and is the primary mover as oppose to the main on the 35.5. Putting a 150 percent genoa on the 376 would only make the boat go slower over all. The 376 (380 and 386) are primarily 3 sail boats--a big main, a jib and an asymetrical chute. The difference between the two boats was a design difference, hense, the different length for the jib block. Both boats should point equally well unless the 35.5 has the short, bulb winged keel in which case you need to fall off and foot for speed which the boat has in abundance. A 150 has a larger foot and needs more block adjustment thens a 100 or 110 jibI had a 35.5 and now have a 380. By the way I interviewed Steve Pettingill (race skipper for Hunter) and he first explained these differences to me....I hope this helps.Les