Apologies if you already found this, but here is an old discussion of the topic that went on for many pages:viewtopic.php?f=1&t=3596
It seems there are a lot of quinto in the middle players ... but also a few [including one of the moderators who is a big time pro] who use your set up ... which to me actually seems extremely logical.
I experimented a bit with three but went back to two ... no judgement ... just didn't thrill me all that much using three.
"(although try to develop as much ambidexterity as possible and can play all of what I play both ways round)"
Absolutely agree with the importance of that! I don't do EVERY pattern both ways but I do practice marchas both ways and my [I am also right handed BTY] my right palm tip is just as good now as my left ... and also my left slap is just as good as my right. I often do adapt rhythms to substitute a left PT for a right when in makes more [in my opinion] ergonomic sense than a pattern written out with all the PT's in the left hand. Tomas Cruz actually gives an example of a marcha played that way in one of his books ... so if someone thinks its wrong ... go tell Tomas