I used to use both 14K flux's and 20K radiums but on the 250 watt side. They fire fine on Vue ballasts, especially the controllable ones with overdrive. On the Vue, the regular 250 is fine but the overdrive looks just like an M80 which I prefer. I have had both Vue's and old school M80's.
Sad to hear the 14 flux's are gone, those were my go-to for MH bulbs.