Best option would be to run thinner tyres on the front and fat 205's on the back all with the same profile. Also consider spacers for slight rubbing on those Jelly beans.

The SSS struts would be fine and a nice brake upgrade. i would only worry about the strut travel if you want your datto to sit on the ground. heaps of datto's have Stanza struts and have used them for many years.
Plus the fact that you already have them and can save some money and upgrade at the same time.
you have some nice parts there, so if worse case senario sell all your rims and spare struts $$$ and go with some 14inch rims or even better 15inch rims. Now that you have disc brake front no prob's.

goodluck with your datto mod.