Hey Andy ~
1st off Congratulations on drawing a great antelope tag!
I have been on pinon canyon numerous times; and have hunted it for sheep, deer, and antelope on different occasions over the years.
I will not be in pinon for antelope this year, but will be 135 right next to it, and spent all day yesterday scouting the area and saw some real nice bucks. Looks like the rain really helped out and the older 3-4 year old bucks are carrying some great mass this year. The peak of the rut ended about a week ago, and I really feel sorry for the does that are coming back into cycle as they are getting ran all over the country by 4-5 bucks each.
As for Pinon, I have NEVER seen the antelope go into the P/J's when the shooting starts. They tend to head into the flat open country where they can see you coming, but there will be some at the base of the Hogback; many on Tyrone flats, prior pond, and Joella windmill area. If you have a chance, take some time and go all the way northeast on red rock road and around cedar hills. There are not as many, but usually some very good antelope from Rouke Resivoir east along the boundry to the Ruins, and the top of Iron canyon.
It took you atleast 7 year to draw the tag, so take your time, don't get trigger happy, and you should be able to shoot a great antelope.
Good Luck...Stryker