hey Brad,as mentioned today i am having similiar issues but in the y axis,i purchased a new grease gun today,with flex hose fitting and i must not have been getting any grease in the system with the other gun because it was a night and day difference in pushing the grease into the fitting instead of all around it.
my y axis is still groaning but i think that has something to do with the recent ball cover replacement and constant spraying of the guides to clean the chips from under the way covers.
2007 Haas TMP-1 Microscribe MX-5 Mastercam X4 Mill Level 3 Surfaces,Solids Seagate 2 tb hard drive AMD 64x2 8gig ram windows ultimate 7 64bit Geoforce 8800 GTX