Yeah, when CR2 came out the archetype's focuses were changed. My main was MA-stat in CR1 with starting +points to Perception. Now he's usually a MKT because Perception's now useful for MKT/Guns instead. Pretty sure the hover-text on character creation was updated with the correct new designations in terms of what's good for what.
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The way attributes work is that they grant you percentage bonuses (%). Those "Bonus %" percentages only apply to any actual points you have as a base on your buffer bar. They do not apply to buffs granted by clothing items.
So, because there's no health regen rate abilities in Operative, Vitality won't help your health regen. The most significant effect upon Health Regen by Vitality is Fast Healing/Fast Healing 2.0. A 30-Vit specced Patcher can give out 90% Health Regen FH2.0s. The same goes for IS regen. Only a few abilities grant IS regen, like the Network Attacker title buff. None in Operative do, so again Vit is worthless here for you.
As far as resistance goes, the same. Resistances from your clothing are not improved by attributes. Once you're level 50, you should be able to achieve 200/200/200/90 combinations of resistances or 180/180/180/140 or so, with the right set of gear. (At level 50, resistance goes up to 240 without a toughness boost, yet "plateaus" at 200. Special attacks will do the same damage to you if you have 200, 201, or 240 resistance. The only benefit of resistance over 200 is that it does continue to help against free fire attacks, and if you get Sky-High Sidekicked or Insiduous Code-ed, the extra resistance will act as a padding and you'll maybe still be close to 200). Where attributes DO help resistance is buffs that give resistance on your buffer: the 4 awakened abilities, Empty Mind, Consistent Technique, Calm Mind/Calm Body, and Adrenaline Booster, as well as certain title buffs and the patcher buffs Viral Shielding/Network Firewall 1 and 2.
If you use these awakened abilities often, the resistance attributes are worthwhile, otherwise, not.
Personally, I prefer to avoid being hit rather than being hit and taking somewhat lesser damage. You're kind of gimped in damage-dealing terms with only 20 Focus, also. So, the following is a pretty standard setup for MA PVP(or PVE, too):
30 in Focus and Belief. The remaining however many points depending on your archetype distributed into Reason for thrown defense if you fight a lot of Master Knife Throwers, or Perception if you fight a lot of gunners.
That isn't to say your setup doesn't work. I haven't tried it, and if it's been fine so far, great. It doesn't matter *THAT* much at lower levels, and I don't know what level you are currently... 23? If you find that how you put your points in while you level is to your disliking, simply goto your org's Archivist Vendor and buy a Stat Hack ticket to run a mission that grants you a Attribute Restat tool.