I'm not familiar with those ballasts and thier spec sheet dosnt give much to go on but their appear to be electronic ballasts. Why do you think these are the wrong ballasts?
Technically all US spec ballasts are the wrong ballast for the Radium. Mostly what it comes down to is finding a ballast that 1st will at least operate the bulb reliable then 2nd gives the desired color/par you are looking to get from the bulb and 3rd you should consider longevity of the bulb. Over driving a400w radium will give superior color and par but will also reduce the life. I will be running mine at ~470 Watts on a s145 ballast but 6 months is the max life span I will expect from the bulb.
In my personal opinion its only really worth using the 400w radium if you are going to over drive the bulb beyond 400W like 430-470 (think SPS dominated!) Otherwise I think the 250 radium with an M80 ballast is a better choice and you will get longer life from the bulb. You can overdrive the 400w with an electronic ballast that has "HQI" mode but if im not mistaken it will be somewhere around 415-420W. Capp does this with Galaxy select a watt ballasts and obviously it works for him.
If those phantom ballasts don't have an overdrive or HQI mode then its probably not worth running the Radium with them as you are just not getting the potential from the bulb.
My questions for you are do you like the color/par you are getting with the Phantoms? Are you having issues with the bulb firing? I could be wrong but technically I don't think your ballasts are any more "wrong" than others out there. The question is really more of are you getting the potential out of the bulb. My guess is you would be happier with 250s running on Hamilton M80 magnetic ballasts. The M80 is still readily available from Hamilton and has tried and true results with the radium.