How Much DH for DIPA

Three days isn't nearly enough to dry hop, especially such a big hop bomb. Consider bottling a week from Sunday. Also consider a smaller 2nd DH about 5 days before bottling - maybe 1oz each of Galaxy and CTZ.

 

You must dryhop at least 1 pound per gallon, minimum .
I have been dryhopping more lately. I keg, so this may not apply to you. I put them in a paint strainer with some marbles and tie off the end. Just drop them in, to blazes with that dental floss stuff.
Then I force carb by shake method and let it stand at room temperature overnight. Into the keggerator the next morning and there is quite a bit of dry hop character, probably from shaking.
I am not going to go as far as to say I extracted it all, but this has been working for me.
4oz in a IIPA sounds reasonable, depends on what you want I guess..

 

You could put the end of your siphon tube in the hop bag, tie it up around the tube, and then cram it down into your secondary vessel. Then, force the beer through the hops in the bag when you rack, and pull the tube out. I don't know if that'd do anything, but the idea I guess is sort of the Randal effect. Sorry, that's all I can think of...I've never been in a situation where I only have three days to DH.

 

You will still get a good bit of DH aroma, not optimal but no reason to worry. It might end up a bit cloudy but hopheads don't care about that...

 

I hope everyone adjusted for the typo of 1# hops/gal. I try not to nit-pick but there's a big difference there

 

With that amount of late/end-of-boil additions, you're probably going to be ok on aroma with only a short dry hop.