As Graham writes, air flow is an issue, I started with my badge bar in the higher position, but with 4 badges I had to switch to the lower position to keep the engine cool enough.
Dam & Blast.
I took the badge bar off today and three of the four badges. However, my NEW limited edition Centenary badge (with studs attached) scuppered my attempt. A nut on one side stripped the thread at the end of the stud and would not come off. Now it will not do up either so is loose with a rattly washer so I will need to cut the nut off eventually (on another day).
I did try the bar upside down while it was off and realised that 'CHAD' would have been re born if I could have turned it. (with only half of the Centenary & MSCC badges visible above the bumper).
The legs on my bar are obviously too long on this model (which my son bought for my Christmas pressy so has to stay).
Drilling extra holes is not an option due to a dogleg in the legs.
So for now it is back in its original position and there it will have to stay for now.