If you're turning the boat to make a good wake, that's the same thing as having more weight in the boat. The 24 is a big boat, and it takes a good amount of weight to sink it. Try another 750-900 lb sack on the rear seat of the surf side. Try weight in the bow on the surf side too. You need to get that boat listing pretty good. Also, bring some human ballast out there and have them sit on the swim deck in the rear corner (be safe). The further on the rear corner of the boat you can get the weight, the better.

Speed should be right around 10.8-11.4 from my experience in a 24.