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Soul
blob of foam is what i use for back filling, only had a few grip it’s fail and i have used a lot of them. what i find odd in your pic is how neat the hole is which should mean a nice secure fixing.
just used some blue ones for radiators in insulated plasterboard so bought the undercutting tool to clear the space behind in the insulation and they feel very secure.
now use fischer duopower for blinds, pictures etc as they use a smaller hole and seem to work well in the insulation, the duotec fixings are good too if a bit pricy.