Hi Charlie,
I've never sailed a 90's Moody 36, but have owned a M425 for 10 years and have sailed a 90's M38 which differs little from Roy's M376. As Roy says, these boats sailing characteristics are classic examples of the IOR influenced masthead rig, with a relatively small main and a large overlapping genoa. However, my preferred approach to shortening sail, at least upwind, is trather different from Roy's.
I reckon both these boats will carry full sail happily up to 15 knots, if you get the sails flat, but beyond that they will feel more comfortable and speed up, if you reduce sail. Particularly upwind, I prefer to reef the main first, as the genoa is the power house in this rig. Even though Bill Dixon's hulls are exceptionally well balanced, weather helm inevitably increases with heel, so taking main off first also serves to reduce this by removing the aft most bit of sail area. Only after the first reef is in, do I look to wind in a bit of genoa at around 18 knots, and then not down to a no.1 jib size (i.e. no overlap) but rather to a no. 2 genoa size, that's the limit of my experience on a M38, but with our M425, I would then go to the equivalent of 2nd. reef in the main following this with reducing the genoa to no. 1 jib size, which she'll carry up to 28 knots if the sails are properly flattened, which is challenging with a genoa rolled up so much. Beyond that performance is out of the window and it's survival tactics.
These boats are not light airs flyers, and our M425 feels as though a switch operates at 10 knots of breeze - she suddenly comes alive as this windspeed is reached, but feels dull at lower windspeeds, not that she doesn't move, but she's much less responsive. As Roy writes, this is probably due to the considerable displacement of these designs, but that has the advantage of making them relatively insensitive to the weight of gear all us cruisers tend to load on board.
It's interesting to read how others approach this all important aspect of sailing.
The 1990's M36 is the next generation of Moodys to come off Bill Dixon's drawing board, fitst built in 1996, so hopefully an owner if one of these will be along soon to offer you their experience of that boat.
Peter.