I must admit that I cannot follow your calculations in total. The speed and load comparison is correct, but I do not understand how you compare the blueprint costs - the C-T01 is free, so I do not understand where you get the factor 19.8x from. Built costs by the way 4.35x for the C-T01 and 3.55x for the C-T-03.
So to sum it up, C-T01 is well suited for defense, C-To2 is the express service ship and C-T03 is the heavy loader.