Colin
I'm having the same struggle with Scooby - since his neutering his coat is an absolute nightmare
I was keeping on top of it myself with thinners and the Coat King but was really struggling so I have given in and taken him to a professional groomers, although I'm not going to have him clipped she did a great job with thinning scissors, much better than I was doing. I had him done last week and he looks so much better.
I treated myself to a pair of Moser Max clippers (around £100) to do the top of his head and his neck as I was doing them with thinning scissors and a week later it would be back to normal and seeing as I've now got 2 I thought it would be easier.
Misty is now 12 weeks old and she already has loads of coat, thick and quite wavy on her legs, so I think I'm going to have a nightmare with hers too.
I'm determined though I'm not going to give in to the clippers