You guys have been busy while I've been away . . .
holco - further investigation has shown that the OX seems to have 3 types. Lex 1 is PtP on Masonite with Solen (etc.) and first-rate ERSE / Jantzen coils. Lex 2 has same high quality components on PCBs. That seems to be what you have. Those coils are good and they match your boards. Don't swap them for the schematic you posted because those values were for masonite.
You can physically measure your coils with an impedance meter if changing coils. But if you change gauge, then the DC resistance also changes which must be compensated in the resistor values. Since you have good coils, I suggest the easiest way out for now is to stick with them.
Go with the Mills resistors. Sonic Craft has New Old Stock Mills, which is best. As beetle said, we're working on custom values, etc. and hope to have news to report by end of 2018. Keep us posted.