I got quite a few of those niles sus in the amps and even though they tasted very legit they SUCKED , and me and my training partner drove down to Queens ,NY to get them so I was not happy with no results from them! but I went to the 98 N.O,C. show in NYC and got in the back of a limo and got some DURATESTONS that ROCKED ! Those were the best sus ever for me and I blew up on 500mgs a week. I started late though in the mid 90's but my buddy said the same thing as you, that the stuff used to be stronger, although I am not sure it wasn't because he was younger and hadn't done it before. He told me the first time he did russian dbol he couldn't believe the strength he got from it.
But I do remember liking the old Brovel and Tornel tests although they always gave me acne, and Aratest always worked good too. AHH the good old days.