Sounds like you have a "knife register" issue rather than a timing issue. A timing issue will affect how much they shake, but NOT affect cut.
"Register" means that the knife should stop at either end of it's stroke with the points of the knife sections just beyond the centerpoints of the "prongs' on the guards.
Some mowers/windrowers/haybines have a means to adjust knife register, but I don't know if yours does.
However, if the knife that doesn't cut well has been replaced, (or it's knifehead), that may be where the trouble is.
Measure the length of the knifehead from where it attaches/is driven to the center of the first knife section, and compare that measurement to the other side that IS cutting properly and see if there's a difference. (Obviously, the left and right knife heads are opposite/mirror images of each other.)
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