Also, Battle pretty much wrote all 4 albums, the Wilt two being his 3rd and 4th efforts, so he was probably improving as a songwriter.
You could also argue the point that by the 3rd or 4th album, a songwriter has exhausted their creativity. I'm not saying that Cormac did, but I'm just making the point.
For me, the On The Turn album is near enough perfection......and it was always gonna be hard for them to come up with something better than that. Especially considering the huge production budget they 'blew' on it.
On top of that, Kerbdog had some awesome b-sides for Sally and JJ's Song.
Wilt were still great, but the My Medicine album definitely sounded more generic (even with Cormac's distinctive vocals). I think they were also fairly inconsistent. Each Wilt album had high and low points, and many of the b-sides were hit and miss.
I loved both Wilt and Kerbdog. But for me Kerbdog were always the preference......not because they were heavier either (I'm not really into massively heavy rock). I just think they had more of a cutting edge.....they did what they do best.