Here's a video clip of Joe as he stands at the minute. I've had a look and I reckon the thing he needs to work on is his follow through. There's a brilliant video on the internet featuring a coach - David Freedman and Aussie Beau Casson who bowls left arm Leg spin and they demonstrate some drills.
It's the follow through drill where Freedman advocates stepping over an obstacle that Joe needs to do so that this step-over aspect becomes a part of his bowling and it's something I've only realised as being crucial myself in the last 6 months. So it'll be something we can work on. In the meantime here's a short clip of Joe as he bowls now.
I don't reckon there's a lot wrong with Joe's bowling all the time he concentrates and tries hard and looking at the clip it looks as though everything is going in the right direction and and I love the way he springs into his stride and gets airbourne!