6-APB was underwhelming, thoughts on the matter?

Hey all! Ripped 180mg of some 6-APB succinate, and was left a little disappointed. I was expecting an 6-8 hour “roll,” but instead simply felt like I experienced a 3 hour roll with a mild psychedelic comedown. I hadn’t rolled since Aug 2nd of last year (exactly 1 year to the date), but had done some 4-MMC in between (most recently in May).

Shockingly, the 5-APB I took last year felt way stronger and I preferred it much more to the 6 I took this year, despite all that I’ve read.

Any thoughts as to why the roll felt short and relatively lackluster? My 2 thoughts are 1) impure product (most likely the case, read that most succinate is compromised heavily of inactive 4-APB) and 2) the 4-MMC use interfered with the experience. Both could also be a factor, but was looking for any additional insight from yall.