Ah, simplicity. I like it!Yes, you should water more often in bloom, it is time to use those roots. I have an easier method than the knuckle test or even weight... I just shave a day off of whatever the wet/dry cycle had gotten down to by the end of stretch, and from then on I water at that new schedule, except every 4th watering I still let them dry out that extra day, so that oxygen can get down to the lowest roots and reenergize them. As far as weight measuring goes, I am sure there would be a number, but also consider that unlike during veg, the plants are now starting to take on significant weight, so it would be hard to determine water weight from plant and bud weight.
Is it also possible as bloom progresses and bud sites fill in the wet-dry cycle shrinks to 3 days and I should then go to 2 days with 3 days every 4th watering?