I have been dealing with the exact same issue as yourself, liking the texture and storage compartment of the MIAD, but the angle (and the finger bump when using the enlarged triggerguard frontstrap) bothering me.
I tried the Troy battleaxe CQB grip for a little while, which is slightly straighter, but it was also too small and too slippery. It's small size was especially problematic to try to use a BAD lever with due to excessive finger reach. My example also would not install without some fitting due to the grip screw hole not lining up, but that was probably just a fluke/my shitty luck.
I also REALLY hated the duckbill-thing on the front; I think it's to cover up the infamous "gap", but it also limits how high my fingers can sit on the front of the grip, which forces my hand into a more extreme angle, negating the advantage of the grip being straighter than most. It also interfered with trying to use this grip with a Magpul MOE triggerguard, which itself fills "the gap" and had to be filed back some to fit. As if all that that wasn't enough to hate that duckbill thing, the round/pointier shape, (as opposed to the flat surface created by the MOE triggerguard) really dug into my middle finger and was extremely uncomfortable.
I really wanted to like that grip, but even having removed the thing on the front, the bottom line was, at least for me, it was just too small, and too slippery.
I have since replaced it with a Magpul MOE+ rubberized grip, which despite having the same angle as the MIAD I had before, seems to fatigue my hand a lot less, and is big enough for my long, spidery hands so that I don't have excessive trigger reach, and can also manipulate the BAD lever easier.
Finding the my ideal grip seems to be a never ending search, but for now I've settled on the MOE+, and it's my favorite so far, despite the angle.