Economical replacement rocker arm set?

I changed my oil again, checked the filter. No signs of anything. Also, the residue that I was speaking about is gone. I am going to do a oil sample test just to be safe.

Question, when I changed my cam from what was supposedly a 285 to a 268 should I have also changed the push rods due to different lifts? I have the old cam so I can measure it with a pair of calipers to compare against the XE 268. I am thinking that things are just loose with the rockers.