Bouncing is normal and the best way to reduce bouncing is to get a cat's body used to lower numbers. With time bouncing will reduce. It's also normal for a cat to feel better in higher number since that is what it is used to. Lower numbers feel like caffeine deprivation to a coffee addict.

You could see him look dull and low energy in lower numbers, but once his body gets used to them, it will love them and he will be playful and energetic in normal numbers.
Being worried about hypoglycemia is normal. We have all panicked when we our cat has first experienced greens. But you are testing enough and know how low each dose is taking him. Even with SLGS he did not earn a reduction from 1U to 0.75U. I would take him back to 1U. If you are comfortable with following TR, you would re-evaluate the dose after 3-4 days.