That's because the Ijoy 20350 battery in that mod performs no better than the better 18350 batteries out there. Only differences is you might get a few puffs more out of it over the 18350 batts.
But don't go over that 22W you are using. That battery is
highly overrated by Ijoy. It's
not a 25A battery.
You won't likely find that 20350 batt and if you do it will be the Ijoy branded 20350 and won't be cheap considering that it's really just an 18350 in a larger body.
Good news is, since it's the same length as an 18350, only fatter, you should be able to replace it with an 18350 and shim the sides of it in with some adhesive-backed foam rubber inside the sled (aka battery holder).
Best 18350 batts on the market is the
YDL 18350D cell or any rewrap that uses it, like these -
Keepower,
Vapcell or
Epoch.