Prestige 550 Swim Platform not able to lift to spec max

[empiper]

Has anyone had experience with the swim platform on a Prestige 550 not being able to lift the advertised weight of 793lbs?  I have a 2016 Prestige 550 and am having the dealer install a '21 Yamaha EX Jetski, dry weight 602lbs, w full fuel, ~680lbs, with chocks, ~760 lbs (well below the 793 max).  The dealer is saying the lift (out of the water) will NOT lift the jetski/fuel/chocks from fully extended.  They said all hydraulic pressures, etc., all check out.  They are at a loss at this point.  Does anyone have a jetski or tender close or heavier than mine that can share any experience?  Much appreciated!