[sswee]

Oh man your all messed up, NOT. You only have a couple of minor problems.
1 You misunderstand the readings you are looking at. In electricity you're dealing with 3 main parts. Voltage, current and resistance. Compared to water, the current is the volume needed to do the job. The voltage is the pressure it takes to get that volume to where you need it. The resistance is any restriction to the flow. PAR (peak anodic resistance) is the coatings resistance at it's maximum. The reading for PAR is figured by dividing voltage by current and comes from Ohm's law. The readings you posted are not unusual. As the coating grows, it creates more resistance and has to have more voltage to push the current through the circuit. When the coating cannot grow faster than it is being eaten by the acid, it has reached PAR. When growing the coating and watching the readings it can be misleading. At a point the coating still grows in thickness but the pore size of the coating enlarges from dissolution by the acid. Which lowers resistance allowing the needed voltage to lessen even as thickness increases.

2 I can't view you pics so it's hard to say for sure. The uneven coverage is most likely due to prep. It could be part to close to cathode, not enough cathode.

Tank temp, connections, acid concentration, aluminum content of the electrolyte, SA mis figured can all affect voltage. A difference of +-5V isn't a problem.
SS