I've tried SLR and SLR gel.

OK for smaller guys, but these were not working for me at all. Same with fizik airione, the worst saddle I've ever tried.

Forget magazine reviews and all that BS, buying a saddle is like buying a pair of shoes, what fits for one does not fit for another. Most italian saddles are designed for 150lb guys or smaller. One size does not fit all. Only Specialized makes multi-size saddles that need to be measured (using a buttometer) and they are by far the most comfortable for a guy like me (34 waist, 190lb, 6'3").