What pitch did you run on the xbo3 mostI ran a quad IV on my XB03/225X 95% of the time. Only time it ever came off was to put on a T3X or Knob Cut for a top end pass at a rally. They do handle great. Mine ran 93-94 with a 1 man fishing load and ~92 with a 2 man fishing load.
When I traded my XB03 for a XB21 (but kept the 225X), I changed to an X-OT for pushing the heavier boat.
If I were you, i'd run the Quad IV unless you're carrying a massive load. I ran the X-OT on my XB03/225X for hauling 4 ppl, etc., but not an every day prop.