I agree that there are very good and very poor chiropractors.
But I think that applies to most everything in life anyway.

Mine doesn't use any high velocity moves or any scary rough adjustments. He is good about talking and explaining things.

I guess because of your wc case and atty - you need to get in contact with atty and request/insist on a different treating dr, as you are not feeling any better with this chiros care.
You might need to search out a replacement so's not to get just any name the atty gets from his list, if he has a list??
Is the chiro your only wc treating dr?

I was going to chiro on the side, paying cash, during my wc claim.
My GP who was my txing dr for my claim too {didn't seem to be able to help when the TOS sx started showing up- she only helped as far as the reg RSI part - the rest was beyond her}
she referred me to a physiatrist- but he was more into spinal rehab not soft tissue TOS type injuries.

Anyway , got side tracked LOL- the new drs place I found has Osteopaths & RNLP that seem to be pretty good, on site they have xray, lab, a PT/gym, bone scan, a 50k back care machine.

I think if I had them during my claim things might have gone even better for me - plus a different atty too.