I would be careful about using the base of the strut to judge how off center the body is. Ive seen some very sloppy castings that would give you misleading numbers. I would also make sure youre measuring off of something perfectly flat, as someone pointed out. Got granite countertops?
Remember that being 1/4" over on the body wouldnt require a 1/4" adjustment on the base. Probably closer to 1/8". Still, thats a fair amount to compensate for, so you may want to get it closer before trying to make fine adjustments (grinding, washers, etc). See if you can have a shop bend it back for a reasonable amount. If not, then a new one is a consideration... but remember that even new ones may need some massaging to line up to the log (the one I altered was brand new).