Can't help directly but does Kodak not give any guidelines for the difference between inversion and constant rotation in its Tri-X literature?
If no-one has any good guidance you could try John Tinsley's approach in his book "Rotary Processing" He claims that by pre-soakiing for 5 mins he was able to stick to the inversion times for a range of Ilford films but admittedly he was using Ilford developers.
I'd have thought that a similar reasoning might apply to Tri-X
pentaxuser