Bought a $20 segmented Bosch from Cripes. I should be able to try it in a few days. I don't really need to figure out how to make the old blade work better, it's at the end of it's life. I can usually judge that pretty well, I've done concrete cutting for years, gone through a lot of 14" blades. It's just amazing to me how good cheap blades have become. Now, you can buy a sub $100 14" blade that will cut what a $350 tiger blade did 20 years ago.
Sub $30 blades in 7" are top quality blades, you can get cheap ones in the $10 range and free postage.