I just did my MasterCraft 230 VRS with 750s in the back, a "650 Lb" integrated bow sac in the front and 2 manually filled fat buddies in the ski locker.
I've used it 4-5 times now and I think I've got all of the bugs worked out. The wake is great. Great enough to give me a concussion on Friday and severe neck and back pain for the last 2 days. Ha!
I used Tsunami T800 aerator pumps, each with their own 3/4" thru hull intake, and 3/4" hose/fittings. This gives me fill/drain times of 12-13 mins but in my V-drive compartments those 750 lb bags are expanding pretty significantly so they're probably pretty close to the 950 lb "expanded" weight rating that Fly High claims.
My biggest "bug" was that I screwed the drain pumps directly into the rear bags. This worked fine for the first few times out but then one of the pumps popped out of the bag due to the large forces it was having to deal with when the boat stopped and started and it drained into the hull. I tried gluing it into place but apparently the chemical composition of the Tsunami pump plastic isn't compatible with solvent type PVC cement like the Fly High fittings/bags are. So, it wouldn't stick. I replaced that setup with some fittings and a 3" section of hose. This has proved to be more reliable and will give me more flexibility if I ever wanted to make major changes to the system.
If I had to do it all again I'd still go with the aerator pumps but I'd probably spring for the 1" hose, fittings and the Rule 1100 GPH pumps.
Also, your really don't need relays even if you go with the more current hungry reversible pumps. They're usually wired straight to the switches.
Here's some pics: