I had a Coronado 25 with a similar motor well arrangement
except that the motor could be tipped up. At times we would
leave the motor down in neutral and really couldn't tell much,
any difference in speed. Reverse needed a certain amount
of speed through the water, just took a little bit of getting
used to. Putting a transom mounted bracket on will move
the weight further aft and unless you go to a longer shaft
motor it is likely the prop will come out in any kind of a chop.
Suggest you work on backing up procedures and keep
your existing setup. Nice looking boat as is.