UT-72 vs. UT-72G

[WSBQ643]

I posted this in the technical discussion forum and thought maybe it would be better served in the general discussion forum given quesitons i have enjoyed reading. 

So, being the impatient person I am I purchased the UT-72 Nagoya antenna without realizing there was a UT-72G which Baofeng is quick to point out for GRMS you need the UT-72G. Not only am I not patient but I am curious as well and "fars" in the Army just made this worse. After reading more on the two antennas I more or less came to the conclusion that the difference between the two was the rod. The other interesting fact is there is no set screw in the UT-72 to remove the rod for tuning. 

I went through the channels and found that 1-7 I got an SWR of 1.0 to 1.1. Then 8-14 I was getting 2.2 avg. The repeater channels went up to 1.8 on avg. As mentioned there was no set screw to remove the rod but removing the protective cap on the tip of the rod seemed to work just fine since a little math said I needed it shorter. I cut 5/32 off the tip and retested and came up with 1.0 to 1.1 through all the channels from 1 to 22. 

I am pretty convinenced there is loading coil differences between the antenna's or at least they are so closely related that a simple tuning of the rod fixed the issue without going for what now seems like a marketing startegy. 

Could someone tell me if I am missing something or if they have encounterd the same issue? 

Thanks.