i grew up on these in the 60s. it is a taste of my childhood &nthey are simple mto make. Even my Thai friends stop by for kanomkhrok 'parties'. if you can find them, they're worth a taste. very cheap, even now in Thailand...perhaps 10 Baht for 5 pairs
what inversions are you using up around f7? and do you have the solo tabbed by chance? great version