Ok, so you are right about getting full. I do too, and so I don't combine my food, I eat one thing at a time for the most part.
Since the scale is a problem for you, it IS a good idea to get rid of it for daily use.
Taking a day to do some reorganizing prep work will pay off.
My main dish I use all the time is an 8oz bowl. See if you have a container that size. Use your scale for this. You want the container to hold 8oz of water comfortably; full, but not right up to the brim.
You can practice putting 4oz of various foods into this container to learn what 4oz looks like. Then put the scale away.
If you usually eat out of this container, then you will always know how much to eat. If it is a little less or more than 4oz, it doesn't matter. Your stomach will tell you when you are done.
If you want help creating a meal plan, PM me and I'll be happy to go over some ideas.