I have got round the problem with the thin IR film derailing. A tip from the maker of the MOD54. Put a previously developed 'test' (you know the ones that come out completely blank!) film on the non emulsion side before sliding into the dev holder. Though you do have to give it an extra soak and wash to get rid of the anti halation coating on the back.
Cheers
Diz
Cheers
Diz