I am curious as to the accuracy of the flow rates mobius shows for my MP40s is this reliable enough to help plan and calculate flow rates in the tank or is it more just a software gimmick? Does it sense when flow rate drops due to dirty pumps and reflect that in the displayed flow rates? Lastly I have 4 MP40s. Has the lower changed over the last 5 years or so? Reason being I have 3 that were bought new with mobius chips and one that was a little older but added a mobius chip to. The older head when set as the master for example will show 2700gph the head on the other end programmed as a synced child at 100% will show a flow rate of 3700 in mobius. But when the other 2 MP40s (both newer) are programmed the same they both display 3700gph in mobius.