I have explained multiple times the difference between Goku's small but substancial improvement after a hard fight and
the major boosts after a near death experience. After 22nd TB, he got a boost of the first category. I have him 1.125x
stronger.
It was implied that Young Kame sennin and Mutaito were stronger than 22nd Goku, but Daimao calls post Tambourine Goku the farthest a human could go, despite having faced Mutaito.
Post Tambourine Goku > Mutaito > Young Kame sennin > 22nd Goku