Bryce,
Same boat with a now dead 2002 200 ficht. Ran the same props your running, If your are realy getting 55 plus on a GPS then your are moving damm good for a 619!
I could never run 55 with a tournament load. I could hit 55 to 57 when the stars and moon linned up, low on fuel, a slight ripple on the water, and down stream in a flood.
Ran a 22p Raker and it would run a little faster then the four blade with a lite load, but the raker could never carry the tournament load well. It was a 51 to 54 mph prop.
Ran a 23p four blade that was great for crusing around and saving gas, It would turn 3500 rpms and be right at 40 mph.
21p cyclone four blade was the prop to run. Low fiftys and great hole shot. held and carryed the load well.
I also have a six inch jack plate on my rig. It helps some but takes alot of work and gas to get it set up right for the little gain you get.
Good luck with your ficht, Mine ran great right up till it died out of the blue this spring.
I have repowered with a Yamaha SHO and it runs great to. Haven’t got the props worked out yet but, the SHO is running 53 to 55 loaded.
MV