Mostly we have a honeymoon period and then it's just a bass.
A really good instrument is one that keeps on getting better as you learn it more - it sounds like you have one in the Enfield. It's not just materially good, it's grown to you.
The Fretless P. How good is it out of 10? if it's good enough keep it, otherwise how much will you loose on selling it and making the beautiful bitsa fretless P you would inevitably make ?