It's like you get used to something, use it for a year or two, start thinking about it, and suddenly nothing seems to work.
I'd been using Jazz III Ultex picks for, oh, a year or two now. Then one day on a whim I picked up the slightly larger picks Chris had printed up for MG Fest, and really liked the pick attack when I dug in - it felt like I had a little more leverage. I used that for a couple weeks, but increasingly felt like unless I was consciously thinking about it I was struggling with digging in a little too much and it just felt sloppy. So, then I grabbed one of the Jazz-sized MG picks from the run a while back, and started going back and forth between that and a Jazz III, but I missed the attack. I had a couple Ultex Jazz-sized "Spike" picks from, um, Clayton, I think, so I tried that and liked it a bit more, but it still wasn't quite there.
Then, while digging through my tray of picks, I found one of the old Dunlop Tortex .88m "Pitch Black" jazz-sized picks I used to use maybe five years ago, and gave it a try. Perfect.
Anyway, the point of this post is that you can very easily drive yourself crazy thinking about this stuff if you're not careful, and I probably should have just stopped a half decade ago.
Christm picks are the gooderstm picks.