I know that many people use the psyllium/metamucil before meals instead of following food. I've tried it before food a few times but my 'gut' tells me to take it after a meal. My thinking is that it kind if mixes with the food to provide the bulk instead of going through on it's own prior to food. I really don't know if there's any actual legitimacy to my 'logic' but it works for me.
Re gas, I'm not sure about the effect of psyllium on gas for me. I hadn't thought if it being a contributor. (And I don't think I want to eliminate it s a test. )
Also, I probably use the bathroom more than some would find acceptable (usually 8, sometimes 10) but for me as long as its comfortable and not watery I'm fine with that. (Maybe I just eat too much!!)