HOLY VEAL, Batman! Look at those roots!!!

That big a plant, in bloom, with those many aerial roots will want more water. You're watering schedule is fine for now. Once it's repotted, after it's finished blooming, the new media will hold moisture longer and the plant won't need quite so much (because it doesn't need to support the flowers), so I'd cut it back then.

Very nice specimen plant!

McJulie