Re: Should I buy an e-kit?
As always the correct asnwer is "it depends...".
I am not familiar at all with Granite drums so i don't know the quality, capability, or sound of your baseline. From what you say, you are unhappy with the sound in any event.
Is it either / or or might you consider having both acoustic and electric drums at your disposal which is to me the best option.
I may be able to offer meaningful advice with a little more information.