"All his awareness was centred on the man stood to his right."

You are describing Philippe's position/place, so you should use either an adjective clause "...who stood to his right" or a the present participle "...standing to his right."

"Even stood a couple of feet apart, he could feel Philippe’s heat,..."

Again, you are describing something and need to use either an adverb clause "Even though they stood a couple of feet apart,..." to describe the verb phrase "could feel" or the present participle "Even standing a couple of feet apart,..." to describe Zevran's and Philippe's positions/places.

"I was stood right beside him."

Here, you are using the past progressive form of the verb "stand" which is created by using "was" with the present participle form of the verb, which is "standing." So, the sentence should read "I was standing right beside him." (Past progressive is used to describe an action which began and ended in the past, but extended over a period of time.)

Clear as mud? Yeah, I know. What can I say -- former English teacher.