I would get a new yoke, if it's not bad for now let it ride then get a new yoke when the $ is available. Speedi sleeve the old one though and toss it in the spares box.
When you install a yoke they get a nice amount of Right stuff in the splines before you put it on, then some on the big washer, before you put the nut on. I'm not sure it's possible to use too much right stuff in this case. Also Right stuff is so good you can then later remove the nut and the right stuff should still hold the Yoke on.
And you think I'm kidding about the right stuff but the last Vegas to Reno we ran I hit a few too many rocks with the front dif. and broke all the bolts out of the bottom of the cover, we tightened the remaining bolts back up and finished 200+ miles with a pretty steady drip coming from the dif but the right stuff was good enough that even missing like 5 bolts on the bottom of the cover only resulted in a drip.