Should this basically be my regular erect girth size, or is the cock ring making it even bigger?
I’ve read all the threads on this topic, and I strongly believe that what you’re experiencing is normal. There may be a few lucky guys whose glans and CS become highly engorged easily, but this is not the way most guys’ anatomy works.
I’m definitely considering seeing a urologist, I would love to get constant erections where my head was really full.
I would love it if my glans became super-full and hard (like the CC) on its own, too, but I highly doubt that any urologist would consider its failure to do so a “problem” worth investigating. If your CC are getting very hard, then you have a normal, well-functioning erection. If you can enhance your erection further with a ring, a clamp, or an ED drug, then awesome, but this is enhancement, not the correction of a medical issue.