I am also experimenting with tabs after having shot with a glove for many years. After trying a half-dozen or so of them, my favorite so far is the Super Archery Mitt which is available from 3 Rivers.
My friend, who is a regular tab shooter, gave my his Super Archery Mitt because he said it was the worst tab he had ever used and he felt it was like shooting with a cast on his hand. Which proves again that there is no accounting for tastes! The Super Archery Mitt is a split finger tab, but it is not noticeable as such when shooting 3 under because of the way it is constructed.
My next favorite is the Black Widow calf's hair tab, which is a 3 under tab. The jury is still out on which, if either of these two, I will finally settle on. But I am shooting better with the SAM than I was shooting with a glove, so the chances are I will stick with a tab of some sort.
By changing your anchor, you could keep your point-on more or less where it was before. Since you're already changing to 3 under, it probably wouldn't be that much harder to change your anchor, if you liked your old point-on distance.