That sounds good. But it kind of depends if you are rising or falling when you finish. If rising do a little more bolus, and if falling do a little less. Just find numbers that work. Try it, test, adjust for next time.
Sure, gtabs are fast carbs. But it’s also good to get protein to help your muscles repair.
Have you read this one yet?
what-should-i-consume-after-exercise
You should hydrate more. And when it is very hot your body has to work harder. So pay more attention to the effort you make rather than the pace.
There is more to your exertion than just how fast you are moving.
That’s why heart rate monitoring is useful.