hi. the zoloft is at a dose that helps many people with ocd, when an ssri is helpful (which isn't always the case...).
have you ever tried ritalin or focalin? looking back, I think those were better for me than amphetamines. id personally recommend some kind of sustained release/all day formulation, but that is up to the shrink, of course.
has your shrink ever talked about choosing one tranquilizer? i mean, either the seroquel or the flupentixol? not trying to nit pick, but ive always had better results with 1 tranquilizer at a time, now and then with a low dose additional one as needed, than taking 2 together. reduces costs, drug-drug interactions, etc.
some ocd people do well with benzodiazepines. i dont think its the best idea, long term, but probably fairly benign on an as needed basis, anyway.
hope this helps.