1) Has anyone directly compared the angel to the diablo tyres? I ride all year round, and in all weather - but I'm due a rear tyre soon and am considering swapping both tyres out for diablos. Curious as to what I'll gain vs what I'll lose.

Not so concerned about decreased tyre life, but a consideration is how much wet grip I'd be losing vs how much dry grip I'd gain.

2) The rear tyre valve is a bit of a pain to access. Is there any issue with fitting a 90 degree valve to the rear? And should this face the exhaust side or the other side?