This study might be of some help
From what I gathered from the above CBD and CBDV seem to be the most efficient for reducing seizures.
Overall, the evidence for CBD’s efficacy in treating epilepsy has been shown and replicated across various forms of TRE. Of paramount importance are the clear benefits this phytocannabinoid has brought to younger people suffering from TRE
TRE = Treatment Resistant Epilepsy
THCV was aslo included part of this study but it seems there is still a lack of further follow up studies. It also states this might be better aimed at treating diabetes but it did show a reduction in seizures.
Overall, Hill and colleagues [94] concluded that 0.25 mg/kg of Δ9-THCV significantly reduced seizure incidence in the PTZ model of epilepsy. Results of this experiment point to a preliminary confirmation that Δ9-THCV possesses anticonvulsant characteristics. This promising preliminary data received little follow up, resulting in a dearth of available information about Δ9-THCVs ability as an anticonvulsant. Whether Δ9-THCV is capable, or incapable of acting as a reliable anticonvulsant across models of epilepsy remains to be seen.
I just posted about a THCV project I am working on and most all the samples I’ve grown have equal parts THC to CBD. I’d be happy to send you some of these to try if they are of any interest to you. Otherwise the best (or quickest) route might be to try CBD and/or CBDV isolate and see if there is any help from those.