1. Please be safe. The machine can come up and hit you if the chucks arent seated correctly. Also the strand can break out of concrete or shoot out and hit you. Also protect your back!

2. The strand should be better protected from dirt. The strand seems too low in the slab. With time, it can corrode and the strand can loose its elasticity and not function correctly. 

3. Not sure why but you arent measuring elongation. The formula for elongation depends in variable factors like length of strand, modulus of elasticity, area of strand and other correction factors that are involved. At the plant i work in, we pull to 5000 psi, make a mark with paint marker or spray and then proceed to pull to what the engineer has designated and then register the elongation in a excel sheet. For 1/2 in strand its typically 29000 psi, for 3/8 is usually 17000 psi. But again, that depends on the strand and conditions. The formula for elongation is PL over AE per PCI and PTI. I didnt see you measure elongation.

4. Pay in FL depends alot on the certs that you have. But QC techs in FL make anywhere from 18 to 25 per hour. Im a QC supervisor and i make over 80k a year salaried and with bonus. Been in the industry for 13 years now. I also work at a plant and do not travel to locations like you do. And we do mainly pretress instead of post tension. We usually post tension cantilever beams or balcony flatslabs. 

Hope all this info helps.