yes, for me it has been trial and error and getting a feel for it eventually. but i suggest starting small, very little correction and see what happens. if you try to make to big a change at once you might be sorry.
the problem of the facets not all lining up, even when you adjust with the cheater is a common one for me – in fact it is most of the time. this stems, i believe from not being as exact as we could be in our earlier meets – assuming you start with cutting the pavillion then any errors are greatly magnified by the time you get to the table.