Don't be surprised if they end up cupping the opposite way when they dry out. I've just about given up on standard treated decking material. It's fast growth, soaking wet garbage for the most part. Loews did (may still) offer a premium deck board, almost clear of knots and sap wood. Very straight and little waste. Much better than the standard stuff, still not perfect.
If you have a very big deck to build, get yourself a Stanley board bender. They are the handiest tool you can have for deck building.
Allows one man straightening of crooked deck boards and "persuasion" of framing members.
I hope you are installing the deck boards with minimal to no gaps between them. Once they dry they will have the perfect spacing. If you install them with 1/8" - 3/16" gaps, you will have major spaces when dry - 3/8" - 1/2" - enough to catch a women's high heel shoe in them.