Peter
Seriously you should find the Avons do suit the Ace and Aceca. Good Choice, glad they are cheaper inclusive of carriage than in USA.
Over the past few years I have experimented with tyre pressures with the Avon Turbosteel and find for fast road use, I run the following pressures:
Front 28Lbs. Rear 30lbs
Track use increase pressure by a few lbs.
22lbs & 24lbs as per AC manual for crossplys results in tyre squeel, much too soft for Radials.
Bill Griffith in Tasmania tried various pressures and came to similar conclusions.( about 30psi )
My Ace BEX333 is fitted with a TR6 antiroll bar up front, is your Ace /Aceca similarly equiped? No rear anti roll bar fitted, Andy Shepherd runs anti roll bars (Swaybars) front and rear on the track with 15 inch rims, but not comfortable for road use.
Why buy 4? Do you not carry a spare? Or do you carry tyre levers and puncture repair kit. Touch wood even in Germany last year 2141 miles in 8 days I didnt have a flat, but A few members have had punctures 300 / 1000 miles from home. Better safe than Sorry.
Keith