It looks like Mitko has gotten outstanding results on a FET he found. To me, the packaging looks like a SIR800DP, but I can't find it anywhere around.
Post #615 here: https://budgetlightforum.com/t/-/30080, data sheet: https://store.comet.bg/download-file.php?id=7648
Talked about here as well: https://budgetlightforum.com/t/-/35815
If anyone can find it, please post. Mitko was seeing 5-8% bumps on amps, and he mentioned they were even pretty cheap. Dunno about any side effects though.
For those who can shed some light on it, please check out the data sheet. I'm thinking there may be an equivalent sold under another name/part # somewhere.