G t E,
Having read a few of your posts, one has to respect your aeronautical knowledge and presumably ability.
I personally consider microlights to be my worst nightmare at low level. No offence to those that take pleasure in them, but you are mighty exposed and not the most visible. I generally get tranxfixed trying to work out which direction you are going in, if your track is not actually crossing mine.
I was in a PA-34 last Sunday and to be honest the horizontal viz was so poor, I would never have seen a microlight cross country - makes you think.
In the instance you relate to, my hope would have been that the AFISO had tried to reiterate your position to the PA-28 and would have appreciated the speed differentials and had his head out looking to see the PA-28 closing on you.
I remember being at the hold at SEN last year cursing that I was waiting to line up behind a microlight that had been on finals into a 15 kt headwind for what seemed like an age. A B.58 had been crosswind and was right up the chuff of the Microlight on finals in a very shortspace of time - the TWR told the Baron to go-around.
Would loved to have seen the expreesion on your face when the Cherokee came abeam you!