I normally dry hop 2 oz for an APA. As said dry hops are all about personal preference, so the amount can be a tough thing to advise on. I dry hop for ~ 7 days, then keg with maybe another oz or so in a weighted nylon bag. I sometimes cut off the foot end of a pair of pantyhose for this. I say use what you have this time, take good notes when you try it, and you'll have a better idea how to adjust from there next time.