honesty, yea it kinda does hold water for a long time while in veg under my T5's, but when im in bloom (2 gal pots) i can feed every other day except the last 2-3 weeks of bloom i can feed everyday... i have some in 2 gal. smart pots and those can be feed everyday but i havent noticed any difference between the two methods.
also, coco is hydro, so you do want it to hold moisture, but i get what your saying...
i just find that adding perlite isnt worth the trouble if it doesnt make the end results improve, and in my experence it doesnt. i think the extra feedings only add a noticible boost in yield if they are extreme, like 4-6 feedings a day will add a easy 10% on to your yield compared to feeding every other day.... BUT going from feeding every other day to every day doesnt really change much... or at least in my experiences.