Being from the UK I always smoked spliffs with tobacco so never had the problem you describe. However, during the first lockdown I decided to finally quit fags so it meant also eliminating baccy from joints. I tried vaporizing at first but it was just shit to be honest, felt more like a waste of weed then combusting. I got sort of high but nothing like a fat spliff. So I then decided I would have to smoke pure joints, American style. Very different to spliffs so took some adjusting but now they are just the same as before, minus baccy. I only run into issues if the bud is not very well cured or really toxic (sprayed I guess, or not flushed?), then I get the problem you mention of it not staying lit. Otherwise they burn fine if you roll them correctly.