Hi Stuart,
We too caught a lot of very small trout, some as small as 3 inches. However, I had 6 trout between 1/2 pound and a pound. I caught all the better fish on a size 10 peacock Pennell. For me the hotspot was that burn you mentioned at the left back end. There a trout of at least 2 but closer to 3 pounds jumped maybe 3 feet in front of me. Never expected that size of trout in such a small loch.
CU
Jeroen