Counting Letters & Returning Greatest Won't Work When There Is A Tie

I have managed to get a nice array formula to look up count all the Rs As & Gs in some cells and return whichever there are most of (the cells are linked to/fed from another workbook with cells that have either an R, A or G in - nothing else)

And mainly this is working but on one set of cells it returns nothing as there are 2 As and 2 Gs - what is really annoying is that on a set of cells on a another section of the tab there are 5 A's and 5 G's and that returns an A.