first, how old are you, if you are young, don't worry about your traps. Second you have been deadlifting for a whole month and a half and your traps aren't huge yet? If you just started doing deads i am pretty sure your lower back is going to be your weakness, and your hams, so your it is going to a little time for everything to catch up so you can really stimulate the traps. All you are going to really need is heavy deadlifting and 4 sets of power shrugs a week. A power shrug is an explosive shrug, dynamic lifting is much more affective for the upper back than just standing their doing isolated movements. Do a search on the net for proper power shrug form, if you cannot find something i will look for you, i had a link but the board went down and never came back, where i had put it.