The Caffeinated version of Focus XT may be the right route for you. It seems that SOME of the users that experience what you have (basically the exact opposite of what you'd like) don't react the same way as with the caffeinated version. There is a good possibility that the caffeine offsets some of the negative effects that users complain of.
I haven't noticed the tiredness myself but I have figured my dosing scheme for different settings pretty well. For class I do 25/75 (caff/non), studying 50/50 and training peeps, working out or teaching class all caffeinated.