I think it would make great sense to retcon that 22nd Goku wasn't much stronger than 3 years prior. I don't see how he got stronger when all he did was roaming here and there.
Goku definitely had gotten much stronger but not the "10x stronger" than fans like to believe if Tao Pai Pai is considered as a relevant benchmark even after Tenshinhan battles Tenshinhan. Remember, Goku was explicitly stated to represent the limits of the human race by Piccolo Daimao and that should encapsulate Roshi's sensei who is presumably stronger than himself in his Prime.
Chapter: 135, P6.1
Kame-sennin: “Despite the cute name, [Piccolo] was an outrageously fearsome person…His strength was extremely overwhelming…[ ] He was an opponent we were utterly unable to oppose; not only my younger self or Tsuru-sennin,
but even our master, Mutaito. ”
Chapter: 144, P7.1
Context: after seeming to kill Goku
Piccolo: “Naturally, this level is about
as far as a human could go.”
22nd Goku also surpassed Korin which is a huge deal.
Chapter: 150, P13.2-4
Context: Goku asks Karin to train him more
Karin: “Unfortunately…There’s nothing more for me to teach you…[ ] Yeah…I understand how you feel, but…
You’ve already acquired enough power to surpass even me”…
Note: Previously, I had mistakenly put that Goku had
almost gotten more power than Karin, due to carelessly mistaking
mou sude ni/"already" for
mou sugu ni/"almost"/"very soon". Sorry about that.
There's no mistaking that Goku got significantly stronger but that is limited by Tao Pai Pai remaining as a relevant benchmark. If I had to guess, Goku likely got 2-3x stronger since his battle with Grandpa Gohan.