150 hp vs 200 hp?

[Para]

The V20 is the most versatile small boat. Stout enough for in-shore salt water fishing, but svelte enough for water skiing. Perfect.

My last boat was a pudgy 20 ft cuddy with a mercruiser I/O 170 Hp (4 stroke)
With 3 or 4 people in the boat it was OK (not great) at pulling a skiier out of the water on 1 ski (2 skis no problem). Based upon this logic, I'd probably want a 200 hp 4 stroke engine in a V20

One possible answer is to go 2-stroke but I dont want a 2-stroke. I troll for stripers alot and they just cant seem to go slow enough AND they load up after trolling for a long time. Perhaps a newer 2 stroke would not have this problem.

How many Hp do I need in 4 stroke to get what I want?
(I suppose I CAN'T go past 200 Hp, right? What does the capacity plate say on these?)