I've noticed that around the 2nd week or so, mine really shine. I just "cold" dry hopped at 55 degree's with simcoe and I don't know if it's because of the temp...however I'm having the hardest time picking up on simcoe at all. However, it's my first time dry hopping with simcoe in the past couple of years so I don't have a baseline with that particular hop.
I tired to cold dry hop with 2oz pellets and 1 cryo simcoe in 4.5 gallons at 58 and it was completely unnoticeable. This was last fall and my first foray with cold dry hopping. I ordered some more on amazon to rescue it (gotta admit, though I mostly buy from YVH, the artisan hops brand, while more $ than YVH has provided me stellar hops each time I’ve ordered). Anyway I tossed another 3oz pellets and let the keg rise to room temp (65ish) for 3 days and man what a difference. Fruity and slightly piney. That was also the last time I’ll dry hop cold. I still soft crash to 58 or so theN Let it rise to 65 for 3 days, then crash again. It wasn’t intentionally hazy (grain was from the more beer single hop series, just 2 row, some c20 and carapils I think) but A15 Plus all that dry hop was decently hazy.