We are in the process of laying up some medium-large molds. I want to avoid any warping of the molds.

How many layers of glass mat and ounce weight do you well versed mold makers use?

My schedule is usually:

Tooling Gel coat 20 to 30 mils thick.
1 layer of 1oz fg mat.
4 layers of 2oz fg mat.

I only lay up each layer of glass every 2 to 3 hours apart to prevent overheating of the laminate. I also plan on leaving the curing mold on the plug for 2 days. Think this is long enough?

I've made many small parts molds before so I don't worry about warpage with those.