It's tricky and a bit trial and error IMO. Some people go more often than others, naturally. I find when pain worse I need to go more often, whether due to pain or stress, or diet management to try to control it I don't completely know.
I would say going more often is fine providing the consistency is good and no forcing is needed to empty the bowels.
My diet, IBS state and psychological handling of it at the moment results in me going twice in the morning most days before leaving home and I'm usually good for the rest of the day, which for me is good, as with IBS I can often feel the need to go a few times during the day but when I get to the loo I don't need to, but then do, but not :).
Not sure what to suggest, depends on what you are already doing? With cutting out coffee completely, drinking more water, only 4 cups of tea a day, and at least a glass of apple juice in the evening I seem to be able to empty bowls completely each morning (albeit usually with two BM's within 30 mins) and that's it until the next morning. Not sure if this is temporary improvement however and despite this had a really painful after-BM expeerience the other day and feel I have regressed a bit.
All the best and I hope things improve for you soon
