I'm using the same clay (Meguiars smooth surface clay kit) as my Jawzey. I did read about some more agressive clays, but people complained that it was too aggressive, so I held off. I was planning to polish too though so maybe I didn't need to worry too much about that.
I really get the feeling in my case it just might have been paint defects and very small chips. I have a few I can see but it did feel a little rougher than I would have expected with the baggy... Still, it really does feel glass smooth with my hand without the baggy, and I must have gone over it a good 3 or 4 times and just did not see any thing else coming off. When I started I could REALLY feel it with my bare hand, and I saw a lot of contaminants coming off on the clay.
In any case, I already started polishing (mark I think you saw my other thread where I was asking for help this past weekend). After the help from you guys and some more practice I got my issues worked out and things were looking good- so I'm going to keep pressing on and see how things go. Maybe next time I'll experiment with a more aggressive clay and see if I get different results.
The Tahoe you see in my Avatar, was the particular vehicle that I was having difficulty with, with the Pinnacle Clay Bar.
Once I switched to the Mother's Yellow Clay, things went real good, and much faster.
(The entire truck was Iron-X'ed and washed prior to Claying)
I let the baggie test be my eyes on every square inch, and with a non-rushed attitude, I pressed on, and got the truck all done. (I knew paint correction would be another day)
My main priority this time with the truck was not speed, just the best job of detailing, and correction that I could finally muster with all the tools, products, and new tricks I learned here. This truck needed a facelift, and makeover.
And it paid off!
I scratched my head over this, why the Pinnacle Bar was having difficulty on my thought to be really clean paint? Evidently the paint wasn't as "clean" as I thought!
And like you, I wasn't seeing anything on the Clay Bar with additional Claying to get rid of the "Bumps", with repeated useage. As I said, it was taking me 2-3 passes with the Pinnacle Bar, and even the Mother's Bar struggled a bit, but seemed more aggressive, and positive.
My conclusions, and only logical explanation of what was stuck to my paint, and wasn't showing up on the Clay as dirt? Tree Sap. I could be wrong about this, but I cannot think of any other contaminant that would make my paint feel like sandpaper with the Baggie Test.
You may be experiencing the same issues with Sap perhaps?
Do you park near any Trees?
Mark