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From the info that I got from the PO of my truck, I have almost the same suspension setup as you, 4" OME Heavy+ with MAF shackle reversal . No issues with the Toyota driveshaft showing splines for me, but as mentioned above it sounds like you might have an aftermarket driveshaft. Here's a photo of the shackle angle on mine, let me know if there's any other photos I can take that would help.
I have a MAF SR kit on my truck with the original springs up front, the shackles sit dead vertical. I do get vibration in 4 High from about 20-30mph. It’s not a lot, but it’s there. I recently had the front driveshaft rebuilt with longer splines, fresh u-joints, and some clearencing around the yolks so it doesn’t bind up under full stuff - no change in the vibes though. It has shims but I don’t know what degree. Maybe it needs a slightly different angle.I'm in the process of doing the shackle reversal on my 60, I have Man A Fre's brackets. I'm in the process of doing a cut and turn right now to put the pinion up toward the Tcase and putting my double cardan DS (wasn't on before.). I also have OME Heavy+ and on 35's.
I am planning on using 4 High in the mountains here on the western slope of CO, mainly for winter driving.
I have one question, do you have any vibration in 4 high at any speed? (I'm assuming your setup is the same as mine.)