I have the same hitch and it was set up incorrectly by the dealer. My trailer before this one had a Reese Dual Cam hitch and that one was also set up incorrectly by a different dealer. Don't trust the dealer set up!! Get your manual out and start from scratch. Start by removing the "L" brackets and make sure that installation is set up correctly. Note that there is an "A" and "B" set up for the "L" brackets. Mine was set up for the wrong installation and the lowest adjustment for the "L" bracket was way too high! Only one set up ("A" or "B") is correct for your trailer.
The bars on my trailer were stiff at first but after the first tow they moved easily. The fittings that the bars slip into on the hitch are supposed to be lubed and torqued to 45 ft lbs, no more. I suggest that you remove the bolts and nuts and clean and lube those receptacles, reinstall and apply the proper torque. Use a grease that meets the requirements stated in the owner's manual. If you don't have the owner's manual download one. Use the proper torque for all the hardware as listed in the manual.
The Hitch and/or "L" brackets should not be raised or lowered, and the hitch angle washers should not be removed for the purpose of making the hitch-up easier, UNLESS the weight distribution measurements remain in the measurement ranges stated in the manual.
I really like this hitch and find it easy to hitch up when properly set up. If the camp site is level and I have the truck lined up straight with the trailer I do not have to use the snap up tool. If the site is not level and/or if I have the truck slightly out of line with the trailer then I sometimes need to use the tool to get one or both of the bars onto the "L" brackets.
You can play around with the hitch adjustments but unless you use the manual, and start from the very beginning of the set up, you will never know if it the set up is correct.
Hope this helps.