ok..lame, i have to retype this whole thing again cause the forum decided to log me out =(

anyways, i had the same issues too. few things i found out

1) alt button is spotty when using isboxer and tor at the same time...
2) character that invites is group member 1 (for target party member 1) I rebound this to my F3 Key
3) I rebound the basic ALT + F (creates a focus target) to CTRL + SHIFT + F12 and mapped it to my G3 key

now, after leaving or entering a zone, or after cut scenes i just hit my follow button (i remapped this to CTRL + SHIFT + F3) it targets my main and then I follow it up with the G3 button and im all set. I havent had any issues with this since I left the Alt button behind