I have a really tall enclosure (18"), and I built the DIY humidifier. It was not powerfull enough even with a 60gal air pump.
However, by accident I found a solution that really works.

Attach a small air stone to a long length of hose and use a small quiet air pump (10 gal is good enough). Then put the air stone right in the water bowl. I got my humidity up to 87% in three minutes. I have an inline flow adjuster so that I can regulate how much air gets to the stone. I have been able to get the humidity down to a regular value 56% or raise it during a shed.