+1. Add your dry hops to the primary (no muslin bag needed) when the airlock is still going around 6-8 bubbles a minute. Adding them at this time allows for any oxygen introduced into your beer fermenter to be scrubbed out from the residual fermentation still going on. Yes you will lose some dry hop aromatics so to counter this add a bit more than you normally would for your recipe.
If you have the ability to cold crash your fermenter, then let your dry hops go for about 5-7 days swirling your fermenter every other day to keep the dry hops in suspension. Before cold crashing switch your airlock to a single piece s-shaped airlock, fill it with a small amount of starsan and then cold crash for 3 days if possible. The s-shaped airlock will not allow any back suction of water from your airlock into your fermenter like a 3 piece one would (ask me how I know
The cold crashing will drop out your hops and allow you to rack off a clear IPA! Good luck!