By far the most plausible explanation appears to be due to the larger molecular mass of 1V-LSD as compared to other LSD-25 analogues (and of course LSD alone, which has the smallest molar mass of all lysergamides), that may most likely affect how it is metabolized by the human body, https://emiliomicwp.ktwiki.com/905646/facts_about_1p_lsd_150mcg_art_blotters_revealed