Thanks. Have you ever tried this one? https://www.nomadtravel.co.uk/travel-store/mosquito-insect-defence/mosquito-repellents/trek-natural
Sorry, no I haven't. It's based on Citrinol which I've never found particularly effective for me but different formula work differently on people as far as I can tell. I'm told it's all about disguising your smell so I guess it will depend on your body chemistry.
I don't use a net over me in the hammock, In the UK I just apply a natural insect repellent and that has worked so far. It also keeps the slugs off your face when ground sleeping