I don't have a 21V, but I've got a 22 SSV which is fairly similar. I have the 500 lb sac up front and two 500 lb sacs in the rear, but I don't completely fill the sacs in the rear because I have another 250 lbs of lead back there. I usually fill the rear bags about 2/3rds full depending on how many people I've got in the boat. I put the wakeplate anywhere from 1/2 down to all the way down depending on what the wake looks like. I used to ride 75' rope length at about 24 mph, but I shortened to 70' and slowed to 23 mph. It took me most of last summer to get it absolutely perfect, but it's a finely tuned wake now.
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