My 97 sales brochure on the lx is 190 hp, 44-4800 rpm, Alpha drive:
O = 1.62
P = 1.81
H = 1.94
No Bravo 1 with that engine, Bravo 2 and 3 for large boats but numbers are 2 and higher as you would expect.
Edit: I think you are getting distracted. I think you were where you want to be with the 4 blade alum, dropping 1 inch in pitch from your current prop. You want things that a lot of thrust gets you at lower rpms which is what shallow pitched, multi bladed (and larger diameter too but not necessary here) get for you. Once you get your "gear train" setup up for that, you can expect to over rev on light loads, trimmed to suit, and WOT.............................Welllllll cut the throttle back to where you are comfortable with the rpms.
Besides my arithmetic says that 5000/4800 is like 4.1% ovder rated...which is just a guess under usually estimated worse conditions. Heck you have more error than that in your instrumentation. On harming the engine if you do, heck, my 2011 little push rod, conventional GM V8, of 4.8 L is 302 HP rated at 5600 rpm and it's not a marine conversion, made to run wide open all day long!
I think you got lost in the fog. Back your scope up from 10 to something like 3 or 4 and get a larger field of view. Good luck!