you don't have to defend the guy, the blow job thing was only a silly remark.
we both have the same vision for john wesley harding. i find it underproduced too. but the songs would never have survived the nashville treatment. as for blonde on blonde, it was a perfect solution. i would love to have more musical depth with the john wesley songs, but i wouldn't know how it could be achieved. and then, the sparse-ness really kinda develops its own life.
self portrait: generally, many overdubs here make the whole thing even worse. most songs have a syrup-y quality that is interesting, but i still think the production is dead wrong. if you check out the bootleg series release, there are songs from those sessions that are terrific. none of them has strings or oboe or other shit instruments stacked on them. the two songs you mentioned sound better without the overdubs, i believe.
we will never know, but i think seeing self portrait as a joke that dylan played on us is revisionism. the record is everything he was able to deliver at this point, in all its directionless and weak glory. the man had no inspiration to write. and when he did, all that comes out is a bored song. little sadie, living the blues, belle isle, alberta,... these are hack jobs. and giving them the syrup treatment did no good.
johnston is to blame because he was responsible for the overdubs (6 sessions/full days!). the damage he was about to do can be seen if you compare if not for you, new morning and sign on the window, released versions versus the johnston overdubs.
(sorry for turning g45 into a dylan board)