Yep you have voiced several nagging doubts I have had for a while.

Im going to:

1) have a go at inserting another 12 bars of slide between the last verse and the outro

2) add some syncopation (and bring ou the kick drum & ride symbol in the mix)

3) replace the vox during the first verse ( I was after a Muddy Waters sound)

4) Add some howling and wailing lead guit during the last verse / outro

good or bad I'll post the result !

Coool beans !