Yeah I've been thinking of adding them about 2 min off the boil after a bit of a whirlpool and then whacking the filled cube in sink full of cold water to try and get the temp down below the temp that hop oils get bitterYeah with pump. I liked it. Easy to use and clean. But I am not coming in with much experience with other setups so not got much to compare it to.
Don't they say to take 20 mins off times if you no chill. So 30 minute addition would become 10 minute. Not sure how your 15 min to flameout additions would work though? Let it chill a bit then add them?