I can get a near crisp skin, but since I don't know I ever had a crisp skin on a turkey before I might not realize it.
You know, if the day before you smoke your bird, you wash and replace in the reefer uncovered and allow a 24 hour session being dehydrated you'll note the pellicle form which is a very important step in smoking that most seem to disregard these days. Of course you can use a fan to get the pellicle to form in less time without the dehydration effect. But the dehydration makes a HUGE difference in the skin's texture when smoking in a MES30.
I have gotten near crisp I assume this way, but since I have never had crispy crunchy skin I am not one to know. Mom didn't get crisp skin when she bakes them. Pop definitely didn't smoking them in a smoke house, Wait..... I had fried turkey it was..... not very good but I think it might have been crunchy.
Anyway, you might try the 24 in the reefer uncovered it seems to make me and my guests happy. Don't think anyone ever complained. Its just something I guess we give up for the ease and comfort of the plug and play type smoke of an electric, much like the smoke ring. I don't see either as too big a sacrifice for the stable temps not needing to be baby sat when smoking electric.
Brine a day, dry a day, rub lightly with oil just before smoking. Mine comes out great. Good enough I don't much inject anymore and that was my commonplace prep in the past. I don't stick compound butter between the skin and the meat although I understand the idea. Nothing you do to the skin even salt and pepper, will get thru the skin to the meat. Unless butter is injected, I would how it would get in the meat as the body fluids like a human are 80% water, you ever try to get oil to sink into water?
Anyway, I'd try just giving it a 24 hour dry in the reefer and see if you don't like it a lot better. Good excuse to smoke a chicken this weekend to run a test.
I hope you find what you are looking for and can achieve it without too much hassle. Good luck on your smoke.
EDITT::: LOL... Great minds think alike, I just talk too long without getting to the point. Case is a pretty smart fellar!