Your forty cors must be so old they've turned to crap because there's no way a 52/300 should outhit them with a decent bat and ball. Either your bats are so not broken in they can't flex the bat with your swing or the balls are trash.
Yeah, this was far from a scientific experiment, there are a lot of factors at play (some of the grey dots were in awful shape, and I tended to work middle/oppo/line drives with the balls I perceived as crappier and go for pull side bombs with the "hot" balls). I tried to control for this in my mind but the human brain is of course prone to biases. THe age of all the balls is fairly even though, out of maybe 35 balls there are probably 4 newish Hot dot 52/300, 2 new white grey dots, 2 new yellow grey dots. The evil bp52s, bp rockets and ultimate evils and the rest of the grey dots/hot dots/gold dots are pretty old (2-5 years).
I went out again today in -1C/30F conditions, and the white grey dots were performing decently. My OP was based on a lot more than one BP session though.
BTW, bp rockets are 48 Cor so they're pretty high cor as well.
Yeah, my recent sample on the BP rockets isn't that big (bought a dozen in 2015 and am down to ~2-3).
I'm not saying high comp balls are absolute turds at 25-30F (OP may read that way, my bad), but I am definitely convinced they don't get hotter below about 50F and likely get worse, which is contrary to what I've read here.