A long frame is definatley alot better for taller people because I used to ride a tpro and I was awful, Now I have a zona zip and im still awful but alot better lol.
Honestly I think you need to stick with mod for longer and get the feel properly, 2 months is nothing. Im 6ft 2 and I had a low stem and felt cramped, yet the other day I bought the trialtech race which is higher and now I feel fine.