Glad to hear you aren't taking 800mg!
I think the only way is what you said, stopping for several days. I've taken methadone at those dosages, but never for a period of time greater than 10-14 days (pills) and not exactly that dosage, just a pill whenever I felt like it. I've never taken methadone constantly as loperamide is cheap, works just as well at stopping withdrawals, and I don't have to pay money daily and wake up early and drive somewhere just so I don't feel like shit. Besides, since I particularly like the high that methadone produces (though it seemed to diminish with time, like after a year or two of taking it for 1-2 weeks once a month) I'd be too tempted to bump up the dosage until it could go no higher and then I would be really quite fucked. Since loperamide lacks any high, feelings of well-being or euphoria there is no temptation to get high. It raises your tolerance but since it lacks those positive qualities it is easy to taper with. I lack any sources for pills now, and am done with the gross ass smelling BTH (tar). When I finally taper with lope I may buy a half gram or something, but I can't live with myself shelling out a couple bills for 3 grams only to get high for a 3-4 days. The financial loss is emotionally draining, and the high it produces usually upset my stomach and made me nauseous completely unlike the nausea from too much opioids. I believe the cut was some garbage stuff that just made shit horrible, I was plugging it to which usually has less stomach issues than other ROAs.
Usually, at those lower doses (70-90 mg in non-chronic usage, but 10+days) I could get high the next day, but other times I noticed that it blocked any euphoria for several days even with similar dosages - the variable may have been the number of days I took it, but I was under the impression that the difference in blood plasma after 7 days was negligible compared to 10. I know this because I got oxycodone with the methadone and would save 150-200 mgs and this was roxis.
I do have one roxi left which I'm saving for the day that I can feel it, I feel I'll have to be at doses of loperamide of like 4-6mgs for a few months before that is at all a possibility.
What's crazy about the loperamide since I started writing it down, is I don't seem to take an exact dosage daily the doses go like this in order: 52, 20, 88, 38, 82, 20, 72, 48 (in milligrams). They jump from high to low to high to low over and over again. I only took them when I experienced lacrimation which seems to be the main symptom leading to the body aches and cold sweats/overheating.