Your simia is a PERCENTAGE. You have faster training time with a smaller training size, but the percentage is the same, so say 5%. 100 troops takes a minute, bonus is 5 troop, 200 troops takes 2 minutes bonus is 10 troop. In two minutes, despite different training types, you end up with the same amount. What on earth does this have to do with orc production from the armory? Yes, it appears a fully upgraded armory is a highly inefficient piece that serves as ranking point sink. 5 level 31 and 4 level 33 do not take up the same number of squares. 4 level 31 is 4x280 = 1120 and 3 level 33 is 3x400 = 1200, so if training size is your goal, upgrade them.