DougAnd wrote:(edited for focus)
...my size has been mostly inconsistent for all of my life. That has not changed even after my pump Revision in December. My deflated size changes daily up and down with the shortest length being most frequent. My fully inflated size is all over the board. I'm just past five months but in the last few weeks alone I've had half an inch difference. My best so far is actually longer then before my implant.
My deflated length (and girth) varies depending on how much fluid I squeeze back into the reservoir. Sometimes I leave myself 30%-40% inflated and sometimes I squeeze my penis down as far as I can get it, depending on my plans for the near future (date night or going to work, swimming pool or church) and the clothes I am wearing.
My inflated length does not vary much at all, but "much at all" is somewhat subjective. A half-inch variation in length when FULLY pumped seems a bit much, though. My length between fully pumped (to the point of discomfort and "railroad spike" stiffness) and 80% pumped is maybe 3/8". This suggests to me that your pumping technique is not consistent yet. I have been practicing for over a year now. I generally pump up with my left hand and can get to about 80%-90% and then have to let my right hand take over. I expect you (DougAnd) will develop a "regular" technique and find your size to be more consistent as time goes on.
Just my supposition.