I have a recipe that calls for a 3oz hopstand at 170F for 30 mins. I usually chill to 75F afterwards and then dump into the fermenter. The whirlpool hops only get used for 30 minutes. Seems like a waste so wondered about putting the whirlpool hops in a bag and then just dropping the bag into the fermenter after trasferring the wort. Everything is already boiled/sanitized so infection shouldn't be a problem. Is there anything left to derive from the hops after 30 minutes?