Adding washers and head tilt is the proper way of getting the bars where you want them. You try to get the bars at the proper weight distribution with at least 5 links under tension (more is better).
Using less than 5 links risks the chains dragging the snap-up brackets on the a frame or the chain hitting the brackets during turns. Also, if the bars are slanted upwards in the rear, they can crash into the frame.
Try putting enough washers on the pin to allow you to get the proper weight distribution you need with at least 5 chain links under tension. It that is enough then tighten everything up and you are good to go. If not, then tilt the head a bit more, add another washer, and try again. It is kind of a trial and error thing and cannot usually be done on the first try.
If you have not seen it already, I suggest you might want to check out
this thread carefully. It will probably give you some help.
Good luck.
Barney