Hiya
My hubby Jon usually waits a few minutes after testing something before eating it. He doesn't test food anymore unless it is something new we want to add to his diet.
We found it really helpful when he first started on the diet - for the first few months - so that he could figure out what was OK or not. The starchiness of fruit & vegies seems to vary depending on where you are in the world for some reason - so testing helps you figure out what's OK for you where you live.
When Jon first started he also avoided anything that when dark but not black as he wanted to be as strict as possible at the start and make progress faster. Perhaps that was over-the-top but that's what he wanted to do.

Apples are a tricky one. Last year they were not starchy and Jon ate them by the bucket load. This year, through the whole apple season they have been starchy so he hasn't been able to have any.
All the best, sounds like you are doing well...
Chelsea