welcome aboard Lone Star. Used to do some yearly deer hunting around Jasper when I was a kid.
Would Armstead from pinebluff be a reach at 33?
I'd say so. Maybe too optimistic but he could possibly be around at the Saints #75.
Trading down would hinge more on who is available at #15 and who ya think ya might could get later. If someone like Jarvis Jones, Mingo, or Lotulelei are there I think they grab the impact player that fits need.
If the BPA then is a OG, WR, QB, etc a trade back would be more likely. There's no figuring trades though. It may look good for your team but there has to be a willing trade partner. Of the BPAs on the board some other teams has to want to make the move for them. That is not near as easy as some of the Madden-;like trades that get suggested here. Yours is perfectly viable in value btw.