"Fun" with adjustable rockers and hydraulic lifters

A friend of mine told me something similar over the phone last night. Someone on Allpar suggested shimming the rocker shaft up a short distance. I'm going to look for shims, and if I can't find the kind I'd like then I'll try to find grade-5 washers that have the right inner and outer diameters, which I'll then bend to shape and install... Assuming that the oiling bolt hole will still pass properly...