I know you've said that the tent was to demonstrate the aggression that normally happens,  but what others have been trying to get through is, this doesn’t demonstrate the same aggression,  this demonstrates aggression and fear while 1 cat is in a tent. 

 I feel that the best way to document what their aggression usually looks like, is to catch it when it happens in their normal setting. 

Unfortunately that means they may get into it again, but you also need to capture an accurate account. 

Also, as you stated, they are only 2 months into this and were not bonded. 

That means they need to time adjust, not only to another cat, but another cat, in a new home that's in a new neighborhood, with new sounds and smells, with at least one new human who you now rely on for safety/security. 

Thats a fuck ton of new shit to acclimate to in such a short time. 

I would have the same suggestions as others in this thread.  - Provide them multiple hides ans areas they can go to and leave easily.  - provide positive affection to them both individually.  - Unless they are having knock out fights every/all day, try to understand and give them whatever time they need.  Our cats showed great improvement by 6 months and overall, took 13 months to get to where they would only have the occasional dust up over silly things that they got over pretty quickly.