The old phrase goes 'If it ain't broke don't fix it'. You are in a perfectly fine position (same as me), but as you're 6'6" you have a variety of options. In the pack: Second Row (You'd be more likely playing '4' than '5' as you will probably be the taller second row. Blindside Flanker (6'6" is a bit too tall for openside and the front row in my opinion) Number 8 In the backs: Too tall for scrum half. Your kicking is only ok, whilst you could be a bit of a Stephen Larkham, I wouldn't recommend fly half. So, in the backs I'd recommend centres or full back. Overall, I'd say full back because if your good at catching you'l win every single high ball and you're fast, good at kicking and can break tackles which are all key assets to a fly half. But, this is only what I think and you may disagree, but if I were you I would try out as many positions as I could in training.
Number 8 definetly
2nd row. that is your position.
I largely agree with what Ace in the Hole said. You don't mention your defensive ability. As a fullback you need to ensure you have a good cover defense and I personally feel that your kicking needs to be better than ok. Second rower is definitely something you should consider - good height for lineouts and ability to break tackles. But wing is also a good position.
