You seem to be counting fine. Did you do a test with 24s prior to running the program? Or after? And I want to be clear I’m not saying your high numbers are bad, just that I would encourage someone with such high numbers to test the next bell up if possible. Some folks just seem to get a ton of reps per session, and some get a lot less, so its not really a comparison.
Awesome job! Also if you’re going to run Giant next, you can always run giant single bell - IF you want to run 3.0 (5RM) with a heavier bell.
Ok great, equipment definitely doesn’t seem to be a limiting factor. Some folks (me in the past) have bells in one place and barbells another and putting together a program with both can be tricky.
I love 5/3/1, but my understanding from you post is you wanted to do Giant (3 days a week of clean and press) and then supplement it with deadlifts and barbell overhead presses following the 5/3/1 template. I don't think that would work with the presses - too much pressing. You could (I wouldn't necessarily suggest it) do Giant 2x a week and press 5/3/1 1x a week, but if you're going to be adding pressing you're going to take some pressing out somewhere else.
Adding squats and deadlifts to Giant is a lot more straightforward, as it becomes more about time available, fatigue management, deciding what is your priority, and learning how to do enough of the "extra" work without taking away from the main work.
To be honest, this is less about learning how to use kettlebells and more about "program smashing." We can totally cook up a program that does kettlebell clean and presses + barbell work (including barbell pressing), and we can use the autoregulated density style training of Giant with the 5/3/1 of barbells, but I think I would cap pressing days to 3x a week, so it would look more like ...
Giant Session 1 | Giant Session 2 | 5/3/1 Press Session |
Giant Session 3 | Giant Session 1 | 5/3/1 Press Session |
Giant Session 2 | Giant Session 3 | 5/3/1 Press Session |
This means one block of Giant would take 6 weeks. You could obviously shuffle sessions around in a week, but the gist stays the same. Then for adding squats/deadlifts it has more to do with time available and desired frequency (both how many total sessions per week, how many times you want to squat/deadlift per week, and whether due to time/energy the squat/deadlift sessions need to be separate form your Giant/Pressing sessions or if they can done "on top of" the existing framework.
Always happy to help.

Hopefully I'm understanding your goals/desires and am being clear.