The set up you show is pretty standard and probably the most popular, so I would be happy with it. To make things run smooth just make sure your fittings and lines are a good make and correct size. I've never sailed a superwing mast on a Blade but whilst sailing an 'A' cat the correct mast rotation is very important. However, the 'A' Cat main is a very high aspect design and can stall out pretty easy. So I would imagine you'll want to adjust the rotation MORE than the downhaul!! which is the complete opposite to my Stealth's Pear shape mast which I very rarely adjust as it is more forgiving to wind/steering shifts.
Try and incorporate as many bungee take ups as possible to keep loose lines to a minimum as they always get tangled at the wrong time.
Have you thought about a seperate kite tack line and a two to one spi halyard (check out what the good Tornado Crews are doing with their set ups)