Hey, sorry for the late reply on this! Number of industries will rely quite heavily on how large your map is. I have the "Distant Industries" mod enabled, which decreases the number of industries generated by half, but doubles production in order to make the distances between industries greater.

Currently running an Experimental-sized map with 97 industries, and I find it's a nice balance. I've just been going off the default generated number for each map size - just make sure you look over your map and resources before really starting the game as it's possible to be missing entire industry chains if there are too few industry buildings (This is true for the vanilla game as well!).