Tahini is really heavy! And I know what ya mean, tahini that is not raw really sits down there. Everything that is raw just seems to digest much better. I think it also depends on the person, some people just cant handle certain seeds and nuts. Has the same thing happened with raw tahini?
I’m not sure about tahini specifically, but I’ve certainly become more aware of the weight of cooked food since bringing raw food into my life. Have you tried raw tahini? It is still pretty heavy, but I haven’t experienced any odd feelings with it and I make raw hummus quite often!