just type in google: huperizine ncbi acetylcholine
because ncbi is in my opinion a great database or ssciencetific research studys where you can fins further information.
i would try for acetylcholine:
betelnut (a non selective muscarinic acetylcholine agonist)
bacoopa Monieri (a not so strong OTC acetlycholinerestase inhibitor, but brain repairing effects, but unfortunaetly it increases gaba a bit)
Aswaghanda ( similair to bacoopa in ACH inhibition but stronger brain repair, and more gaba release, but be carefull its a strong blood thinner which could cause inner bleeding e.g. brain bleeding through its anticoagulant actions )
Alpha GPC (choline alfoscerate)
Ginkgo
White original ginseng (e.g. ginsana)
and for other receptors i would try:
racetams e.g. piracetam, aniracetam etc.
because like its written in the post that thc impairs glutamergic ampa receptors
http://www.guardian....-impairs-memory
racetams are known to activate them (but maybe not in a potent way) and other, like calcium channels
i would give Sulbutiamine a try too.
fishoil(epa, dha) and Lecithin have a indirect but good effect on synaptic transmission because they are improtant for the buildup for the bodies of braincells and synapses.
in my opinion targeting the opioid receptors would´nt have great effects to memory impairment.
because its a side effect of cannabinoid receptor (cb1,2) activation of theses receptors causes modulationof many other receptors lke dopamine, glutamate, serotonie, acetylchline and other receptors
I tried Huperizine A and i would avoid it, because of the non-competitive inhibition of glutamergic nmda receptors (non-competitive means they destroy these receptor, therefore they have to regrowth which would need 1-3 months but sometimes maybe 1-2 years to reorganise) and it was shwon that a impaired function of nmda receptors could cause schizophrenic like symptoms with cognitive impairments
but my greatest advice to you is to go to a doctor with you problems this would you help a lot more out and avoid dangerous side effects of subtitutes like i mentioned above (inner bleeding, overstimulating of calcium channels or glutamate receptors which causes braincell death etc.)