You are off to a great start. I would have recommended the Dillon BL550 or any other good progressive loader, but that horse is out of the barn.
The dimples on the cases come from too much lube on the shoulders, as you've found out. I started out with the RCBS case lube kit, but have switched to the Dillon spray on lube. It's the bees' knees. Put your cases on a cookie sheet, spray a couple squirts on them, roll them around the tray, put them in the sun and let them dry (about 10 minutes). No more dimples.
You got the case gauge. Use it. Often. If you need more .308 cases I've found the current batch of USGI 1X fired cases from Widener's to be top notch. All LC12 and in great shape. Cancel the Sinclair trimmer. For trimmers the Little Crow WFT works great. You get a square trim every time and it is fast, fast, fast. Giraud makes a similar one that deburs and chamfers simultaneously for a bit more but I've no experience with that item.
Good luck, and be safe.