'Stopped sourcing them from Puro?' Afaik this is a relatively new occurrence, and pretty sure it's the first dissected one posted on this board. Guess it will bear watching to confirm what's really the case. Might even check out at my local Yota parts dept.
As far as not being as good as the Thai Denso, based strictly on efficiency of 51%@20um, it wouldn't take much to equal that.
But bottom line on this anecdote, looks good, worked as designed and the OP is satisfied.