I rebuilt my protank head the other day and it has been working fine, it read 2 ohms out the gate. Now a few days later I switched my pv to check ohms again and it was reading 1.6. Then 2.0 on the very next vape and 1.3 on the next hit. What could be causing this fluctuation of ohm's? Anyone experience this with a rebuild and know what the cause is? Any help would be greatly appreciated.