What we need is an auto-upgrader and an auto-micro.
And an auto-strategy!
Flynn did you already tried to doubleklick one of your t1 mexes, so all of your t1 mexes will be selected? After that, click on upgrade and all your t1 mexes start upgrading -> than click fast but not too fast on PAUSE (some times they don't start with upgrading due to a lag or low simspeed I guess - later the engys don't know what to do
). Take 1 to 3 (or more) engys and let them support step by step your mexes. Choose how much you wanna invest into your eco by adjusting the amount of supporting engys or unpause one of the mexes.
you can do the same procedure for t2 -> t3 upgrade.
hf