To bracket or not to bracket?

[BacDoc]

If you have seen my other post I am trying to do the same thing on my 20'. The pros are - longer waterline = better ride, closed in transom is nice in bigger seas and having the motor back further reduces noise.
The cons are(as Fellowship says) additional obstacle when fighting fish from the stern, possible self bailing compromise, prop specs could change and I have heard both scenarios from different people who have done this - slow to plane or easier to plane. Also longer shaft is required. I hope my project is possible/affordable as I would love to have the closed transom and bracket combo.