Don't mess around with a mobile setup if your on private land. Hang a bunch of stands and have a few in the truck to hang once you start to see the deer movement. I hunt from the ground or mobile setups when I have to. Why would you risk the noise and extra scent of a climber or saddle when you...
focus on not getting lazy in your valley. Even with a trigger release you want to pull through the shot. Pull with your whole hand and not just your trigger finger. This will also help make the shot more of a surprise which is what you want.
ideally you will just see the round sight housing. you can run a smaller or larger peep or shorten or lengthen the distance your sight is from your riser to adjust that.
I'd build something you wont cry if you break. The Tac I shot if you missed the arrow was going to be broken. Many of the targets had a pile of carbon laying around them and any course other than the locals course is a challenge even for someone who can shoot.
Mechanicals are no doubt more forgiving. I tune my bows to have field points group with bare shafts at 20 yards, but a little bit of torque and the bare shaft will hit way off. Point being the less your vanes need to steer the more likely they are to correct bad arrow flight. In hunting...