Agreed somewhere around 150-160. As long as the cylinders are withing 10-15 percent of each other, you are good.
Assuming that 150 is the mean value, the rest of the cylinders should be somewhere between 135-165.
Whatever you determine to be the middle ground (mean value) multiply by 1.1 to get the high value, to get the low value multiply by .90. That assumes a 10% difference.