I think this is exactly correct. When people talk about "fresh" acid, or just any batch of acid that seems "cleaner," its probably due to lack of degradation into iso-LSD and lumi-LSD.
I can attest to that as well, fresh acid is always better. Some batches just seem more special than others, and I think its because better care is taken to ensure that its synthesized well and subsequently handled correctly thereafter.
In a way, its kind of correct to say that a batch of acid has a sort of "karma." That karma is either good or bad depending on how well its been cared for. Good acid was synthesized by someone who knew what they were doing, who was an ace at chromatography and had access to high quality precursors and peptide coupling reagents. Then after the synthesis, great care was taken to lay the LSD in a medium that is resistant to degradation (like in geltabs or simply dissovled in DI H2O and stored in amber borosilicate glass). These factors are what give acid good or bad "karma"; this karma simply being the % purity of d-LSD in the final product that makes its way to the end consumer.