Adam, I am very far from being an expert, in Kirinda Nicolas told me, Gerard, you forget everything you know about fishing for GT, here it's different, you throw big poppers, you wait 2 / 3 seconds before you animate, you give rod under the arm a big shot of popping, you wait 2/3 seconds and so on.
Personally, I have my best results with sliders (Orion Flapper) and a popper as the Heru Hamano 150 but at my age (74 years) lead a 200g popper gets a bit tiring.
Usually I never fish with 2 treble, 1 single large on the tail of the popper but at Kirinda I put two, many GTs were taken on the ventral treble.
Treble barbless of course
Sorry for my english