I don't have a vestax table, but...
I do have 12s & TTX1s... I'd imagine they all kinda wok the same with regard to tracking and so on. I'd speculate that the problem isn't with your cartridge, but either the counterweight and/or the tomearm height. My buddy's 12s did the same shit & with a bit of tweaking I was able to get shit straight for him. His problem was the tonearm height.
If you haven't yet, check what Vestax says in the manual about those 2 things and you may wanna also check what Ortofon says (if anything) about the particular cartridge you're using.
I know it's just me, but I HATE ortofon cartridges... Besides, they've been known to wreak havoc on the connecting pins inside tonearms, at least on 12s...
Let me know step-by-step what you try and maybe I can offer some general assistance. I'll sniff around online for more info (and you should, too) if you get stuck.
Good luck.
diendolo