Starfleet South was exactly 1 of the builders I was thinking of.
He's only got 2 builds showing on ebay now, but take a look at his "Into the Darkness" phaser and you can see the front plastic is melted because there is no heatsink, just a 12mm module.
He also uses the word "Nominal" when describing the power to cover himself and admits his 7W laser is 5W or less due to the power source.
I'm guessing yours has a charger you plug into the handle and you don't have the typical sized lithium's battery's in it. He's listing a 3.7V source on one of his builds and I can't see a boost driver do 3W's?
There's no way if he's building these that he doesn't know what diode is in it

and he's using the word "Nominal"!
Other than the power are you happy with it? The nozzle issue can be fixed? Power wise increase i'm not sure as to how he built it??
I have a idea of the good money you paid and wondering if there is still a way to get your money back with ebay because you have metered it.
If I get up the energy I might try another Rubies for you.
This is Starfleets South build with no heatsinking. Look at the plastic tip.