don't enlarge the transfer port. there is nothing to be gained and some to lose.
i guess the guestion is, what are you trying to gain with these modifications?
the 54 has more than adequate power for FT. it is vertually recoil free. it is accurate. i can see maybe trying to REDUCE power.
tell us what the performance goals are and the experts, like hector and others
(but not me) will tell you how to get there.