I think you'll get better results with less hassle laying the 800 on surf side along engine, then putting your other 2 sacks on rear seat. Try and get the rubrail about an inch or two above water. Here is what I had on my pc copied from an earlier thread :

'''You want a 750 beside the motor box and the 400 on top at an angle as you described.
or alternatively a 750 on top that you would not need to fill all the way.
Fill your rear tank full and your front bag half full.
Put your wake plate around half way, 9.8 mph.......enjoy the wave......it will have more push on the passenger side,
but thats the only side that matters'''

Watch for rollers.