Hello and welcome! it's still early days and you will definitely find some days better for taming than others. Definitely don't put pressure on yourself - the signs are encouraging.
Personally, for the reasons the others have put above, I don't like cages with tubes so it might be worth looking at Rapunzel's set-up again? Also many hams find plastic exercise balls stressful and they can cause injuries to feet - playpens and runs are a really good alternative; there's lots of threads on here about these.
Good luck and please post some pics of little Rapunzel when you can (who I assume is a long-haired hammy?!
)