I think a goal kicking coach should sort him out.
Holding the ball at an angle doesn't overly worry me. I don't think that affects his kicking.
Once he's outside 50, he's always going to be marginal as it's right on his distance. Not too concerned about his conversion rate from this distance.
Inside 50 he is good enough to be alot better than 50-50.
He has 2 main problems in my view:
1. He's prone to want to just sneak it over the line. This was more of a problem a few years ago but is still there. He should be told to aim to kick it over the fence every time.
2. When he's well within his distance, he just stabs it off about a 3 pace run up. He looks much better when the kick is about 45m and he takes a longer run to steady himself and kicks through it. He should be doing this all the time.
That's my armchair critic view anyway