ColinTheBald-
Not really my forte I'm afraid.
My first 25mi TT in 2008 was 1:01:29 with no aerobars (I assume that means I did it on a road bike because I don't remember having a TT bike without aerobars).
It took 3 years before I went under the hour - bear in mind I was only racing local H courses.
The year after (2012) I'd taken another 4min off but by this stage was focused on 24hrs so didn't do many short races except maybe the club one.
2016 I'd stopped racing 24hr events, rode a Shiv with extras instead of the PX and also had a car so could get to fast courses and got the club record with a 50:02 on E2 course (would've been sub-50 if not for car on RAB).
2018 After a few goes on the Welsh course and with even more go faster bits I finally went sub-50.
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hippy
Must be that pesky climate change causing stronger winds in both directions.