Well, it does slightly, but nothing too significant. The reason why is SIMPLE biochemistry, gel caps take longer to absorb than taking it directly (aka bombing it on a thin piece of toilet paper), so it actually causes a longer experience as it isn't all absorbed AT ONCE, but over a period of a few minutes at least. When something is absorbed more slowly, it doesn't build up nearly as fast.
Yet, this doesn't apply HEAVILY to 5-meo-amt (be careful, has very toxic effects at high dosages, so do not make a mistake! And many mg scales (cheaper ones 35-150 dollars) are off by a good few mgs. Make sure yours is very accurate by seeing how accurate it is by using the 10g balance it should've come with..) The reason why a capsule doesn't make TOO much of a difference (but still slightly noticeable, as it takes longer to hit you and it usually is a calmer experience as the dose is more spread out in your stomach.) is that most capsules are gelatin which dissolve relatively quickly, so say you do the 8mg in a cap, it may equal the intensity of 7mg of AMT, but definitely not much less than that and it would last slightly longer too (as significant as the weight drop, which is very negligible, but not completely)
So caps seem the way to go and I reccomend with this substance to start off smaller than 8mg, perhaps 5-6mg if you are experienced with 5hta agonists ( classic serotenergic psychedelics). It can throw you a loop at times..
Have you had the chance to try it out yet?? I've always been put off by the reports of toxic effects, but seem people seem to really enjoy it.. So I would be pumped to hear how it felt to you if you had a chance to try it..
But honestly, try to get your hands on some regular AMT, very good stuff, extreme anti-depressant qualities for even days after. (was prescribed as an AD at one time, but taken off the market because of the abusability) It feels like some light lsd or so, with some light mdma. I haven't done very high doses, so maybe the psychedelia and euphoria increase by a lot as you increase dose?