I have not used the proline blue foams but hear they hold up as well as the AKA foams & are a bit softer. So when should you use the new style foams? Always!! Once you use the AKA foams you can not go back to using the old style foams.If you use the old foams in a long race(45min-1 hour) on abrasive dirt & are a decent driver the tires will probably wear out at the same time the foam turn to powder.If you use the old foams at the club level in short mains(15-20 min) the foams will be junk long before the tires especially if you run on a surface that is easy on tire wear. The only problem I have had with the AKA foams is they were too firm for my liking & I had to soften my suspention & with some tread patterns change setup to keep the car consistant because the foams are so firm until the foams were put into the second or third set of tires & then they were not that much softer just shaped better from use.
The proline new foams are said to be noticably softer than AKA so that should be just about what I was looking for & when they say stiffer than the last foams I have a hard time not seeing how anything could not be firmer than the too soft junk they had before.
So when to use the new foams? From a money,time,wear,& frustration standpoint ALWAYS,thats if they are as promised & not just hype.
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, never again.