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I have built many many iron farm designs since the 1.11 update and had similar results.

Using 21 beds, 10 villagers on a 24x24, 2 layer spawning platform, there are minimal spawns. Even with the maximum possible spawn locations in an 8x8 from the village center, i can confirm that it only nets around 20-40 iron/hr.

We in the Bedrock technical community would like a reliable source of iron so we can continue to design and build large redstone projects in survival mode. It is very frustrating to try and build a large project and be bottlenecked by low iron stock constantly.

I think the 3 scared villagers by one zombie mechanic Java is getting is an excellent mechanic and should be incorporated into Bedrock 

Having the same problem with stacked iron farms. Village centers are approx 75-80 blocks apart vertically. Villages are both contained in one chunk. Lower village spawns golems normally, upper village does not spawn golems at all. Upper village will spawn golems if all lower village doors are removed. Playing in 1.9 on iOS. iPad Pro 2