There are some epoxies that give different characteristics with a different mix ratio, but not many, and NONE of those that do not should be manipulated in such a way.
The "stycast" I mentioned has about four different hardening schedules, and uses about three different hardening medias. All yield differing results for heat resistance, high temp softening after cure, etc.
When it is several grams of base media, and a few drops of "hardener", I call it barely qualified to be called epoxy.
When the mix is closer to 50 50, one will find it is more stringently adhered to as both constituents are critical to the finished medium.
Some mixes have to be accurate to within 0.1 grams or 0.1%.