Weighing filler is overkill for a small shop and you're adding a step that eats time on every single job. I've been mixing by eye for over 20 years and my comeback rate is just fine, so the scale isn't some magic fix, it's just another gadget the supply house wants to sell you. The real reason your comebacks dropped is probably that you slowed down and started paying attention to your mix instead of rushing through it, not the $12 plastic scale. What happens when the scale dies or you're on a road call and forget it, you just gonna stop working? Learning to read the hardener by eye and feel is a skill, and leaning on a kitchen scale turns into a crutch that keeps you from ever getting good at it.

Twisted chokers used to seem like no big deal to me either, just a sling hanging a little sideways. Then a rigger I worked with showed me how much a twist can cut into the rated capacity, and once you see the numbers in a load chart it's hard to unsee. Fifteen percent is a couple tons on a unit like yours, and that's the kind of thing that doesn't show up until it does. Glad the safety guy caught it before the load was in the air instead of after.