Express 37 Mk2
You should not be heeling that much in 8 knots of wind. These are not especially tender boats. If you are getting that much heel you have to be doing something really wrong. My first guess is not enough backstay tension. You may need more checkstay tension as well. Unless you use a lot of backstay tension you get quite a bit of headstay sag which powers up the jib. If you put too much backstay without any checkstay, you get too much mast bend and so ease the forestay and halyards powering up. Masthead rigs are tricky to power up and down. Mast bend is good for depowering the main but tough on depowering the jib.
The other thing is that these are reasonably easily driven hulls. For racing they take a lot of weight on the rail. But for cruising you don''t need to carry big genoas and you don''t have the weight on board to carry big genoas.