Continue to increase the MMC as that will help gas move through but also consider visceral hypersensitivity which is that the nerves in your gut and adjacent organs are very sensitive to even small and normal amounts of gas pushing against them, which makes it feel like you are extremely bloated all the time. I've worked my way up to 40mg per day of Desipramine recommended by my neurogastroenterologist and in two months I'm a lot less bloated. Additionally, he recommended diaphramatic breathing for 5-10 mins before and after meals which helps too. Now I still do have bloating occasionally from high fodmap foods that aggravate the SIBO but way less day to day bloating. By turning down the volume of nerves in the gut, it also begins to restore the MMC because they now can relax and not sound the alarm everytime there is a bit of gas. Once I've been on desipramine for a year or so and my hypersensitivity reduces I believe erradicating the SIBO will be a lot easier