My exit pupil probably like yours.
The existing 1.25 focuser does not appear to cut into the light cone
I do not plan to use a coma corrector.
Given the above, I take it you would you keep the 1.25 helical focuser as is, and not bother with going to a 2" focuser. Is that what you are thinking for the Cave RFT?
I don't think you can go wrong either way.
If the existing focuser is a Carle, IIRC, it was offered as an upgrade on Cave scopes. As long as its operation is smooth and meets your expectations l would be inclined to keep the scope original. Otherwise I personally wouldn't hesitate upgrading to a 2" dual speed focuser.
A few years back, I replaced a so-so 1.25" Kenneth Novak R&P focuser on my 1981 ATM 6" F/8 newtonian with a 2" dual speed focuser and really like it.