I've had plenty of experiences with shrooms and while I've never noticed that it being ground makes any difference with potency, make sure you have a scale. A good phrase to describe shake from shrooms is "There is more than meets the eye."
I personally can't take shrooms after taking Copelandia cyanescens. My first dose was a 2.5g stem/cap mix and the second was what I thought to be around another gram of shrooms, ended up being a 3.3g pinch of powder out of my bag and into my OJ. That ended up being a lot more than I needed and the trip was going south after eating them down anyway, but I'll save that story for a trip report.
My many encounters with shrooms let me find my preference in administration. I prefer grinding up my shrooms because the texture and taste of them. If I don't I'm left with an uneasy and sickly feeling in my stomach for the first hour or two. I prefer to eat my dose(usually powder mixed in with hummus or salsa) in around 15-20 minutes, weather it be a 1.5 or a quarter. It gives you time to make sure you aren't second guessing yourself and end giving yourself nasty anxiety after quickly eating your shrooms and subconsciously waiting for your come up. Not to disagree with anyone who thinks it is part of the experience of mushrooms, but I think when the mind is in such a vulnerable state, something as simple as an odd feeling in your stomach or a bad taste in your mouth can start a major freak out and ruin a potentially great experience.