A huge amount of the population has a reduced cervical lordotic curve. It is essentially psysiologically normal.
If it is not symptomatic, then it is really nothing to worry about. I do not think that there is anything allopathic medicine can do for this. Chiropractors would work to increase mobility and range of motion, and if you clear VBI screening, there is very few reasons to warrant avoiding chiropractic manipulation.
Adjusting can be done in a wide variety of ways, it can be very forceful, it can be very gentle. This mostly has to do with the skill level of the doctor. Having been adjusted by hundreds of dr's though, I will generalize and say that some men (especially the muscle bound types who really work their vanity muscles) tend to use a lot more force. Many women chiropractors are very soft - you if you are new to adjusting, you might want to try that route. I have met some women who try to prove themselves with a strong adjustment though - so you might want to ask around and get a good recommendation. If you do not know any chiro patients, you can always call dr's and ask them what type of adjusting they perform. You can also tell your doc that you would like to receive as small a thrust as possible.
A good doctor will just take it to where it needs to go, like anything it is a skill learned with practice.
That said, my kids, ages 1 & 2 1/2, have been adjusted constantly since birth. They are both great and my eldest is already biomechanically aware and comes up and tells us when he needs an adjustment ;-)
I cleaned out my mail box, in case you anted to resend the post,
All the best, Mir