I'm no doctor or pharmacist (I suggest you ask one or both of them) but I'd suggest keeping up with some metamucil and dropping the Colace. Colace is docusate sodium a stool softener that works by drawing water into the bowels. Mirilax is polyethylene glycol 3350 also a stool softener that works by drawing water into the bowels. Metamucil is what is known as a bulk forming fiber. It absorbs water and then expands (sometimes a lot). It can cause you to have soft but really large (bulky) BMs.
In my experience I found I was using too much metamucil. I was having huge BMs. Granted they were fairly soft but still a lot of waste to pass. After I started Miralax I was able to quit metamucil all together. Between my fruits, veggies, grains, and H20 intake (plus reduced dairy and meats) I'm getting enough fiber.
Everyone responds a bit differently and finding your best formula can be difficult. It can take a bit of time. Oh, and if you aren't walking/exercising much I suggest that too. I have a sit down 8-5 job and I make sure to take several walks each day and try to do one fairly long one after work several times a week. Helps in a bunch of ways. I hope this helps.