I also don't use any salt but I have an unlimted Ice supply from work
I will never leave this job. Some times I take 200 pounds at a wack. Any way I have a vacum pack machine and do the same as SIM I put in the freezer. If you have to stack them then either put some stcks between them to get air around all so they can freeze good. Or make sure you rotate them.
When fishing them I like to hook threw the bottom lip out threw the top. I also used something I found in a artical some were that you put a platics wire tie thur the eyes and when ready you put the hook threw the tie and pull tight cutting off the tag end. this worked well last year for me. And you can rig before hand.
One other thing I like to do if the fish are not biting to good is cut the bait from about the middle just behind the gill to the vent hole. When you put in the water this gives the bait a nice wiggle and will get them bitting.
Hope you have good luck
Macojoe