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Any resources to help me determine a TT frame from my road fit file?
Essentially, no. Far too many variables.
You want to find a good TT position before spending much on a TT frame. Depends on how seriously you want to take it, but a good starting point is to get the cheapest beater steel track iron you can find that will fit your saddle height and set back with the lowest stack and longest reach, plus the most adjustable cheap clip on tribars and adjustable stem and spend the next 6 months testing positions by whatever method fits your allocation of time and money. You might want to adjust saddle height and set back slightly to shift your arse around, you will definitely want to experiment with stack, reach and width to your elbows. Only when you know your arse from your elbow can you start to look at which TT frames will give that fit with good ridability.
Any resources to help me determine a TT frame from my road fit file? "Go one size down" was the only advice I was once given, although it did kind of work out last time.