the limit of your performance are the 5.5 hulls. the advantage of the tri versus the cat is the rightning moment. early tris were known for sinking the floats before they could fly the mainhull. perfect turtle machines. but only when you fly the mainhull free a tri would significantly profit from the increased rightning power.

modern tris like the 35ft division tris sailed on lake geneva have a very tiny mainhull and large floats.

if you want a fast boat, build large floats. unfortunately the 5.5 hulls cant carry much weight. i assume the performance of your tri with 6.0 floats would increase significantly.