If you're talking about the cartridges being a little lower than optimal and the bolt head barely gets them.
You need to close the gap by either making the bottom metal recess in the stock deeper (it's what I did) or by surface grinding some of the top of the bottom metal so it sits higher.
And yeah... AICS magazines feed better when cycling the bolt fast. Slow bolt throws can be problematic with aics mags and even factory mags.
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