Leave the leaves, no worries.
Change the water and start again. Start with the r/o water and add nutrients to around 550ppm. Then use pH up to reach a pH of 5.4. The pH should gradually rise, I'm thinking you probably used pH down to reach 5.4, which (if it was the case) leads me to believe you used a pH down product.
When you pH to only 5.4, the pH rise is from the plants eating the nutrients. This is a very stable swing in pH. When the pH reaches 5.8, add nutes back to the 550-600 range. There shouldn't be any need to use pH down and probably no need to use pH up for the rest of the grow, if the pH up you're using is quality.
The nutrient chart provided by the mfg is not helpful, unless you know someone else who has the same setup as you and using the same nutrient mix. Cannabis is a light feeder and a hyper/dynamic accumulator, it's best to only feed it what it can eat completely. The target values Mel Frank posted are very close to a 'general' mix for cannabis which requires very little tweaking. Epsom salts are best for dealing with the differences between strains in the amount of magnesium required. Mag is the largest variable between cannabis strains/phenos of any element in your nutrient mix. To reach these numbers, it helps to have a nutrient calculator, where you can plug in the amount of each nutrient you're using and it gives you the target ppm's for each element.
The "ask lucas" thread on the web has all of this information, and then some.
I have no idea what UC roots is, I do know the mfg's recommendation is usually much too strong for cannabis plants, unless it was created specifically for cannabis. Even then, mfg's prefer people use as much of their product as possible, always start with less than the max recommended. ;)
She's looking a little dark green, 600 might be too high. heh Still looking decent enough. Watch the pH rise today and tomorrow, it should be steady. You should be ok with being away for 4 days (definitely not ideal though) I really prefer to top off the reservoir daily. It keeps the ppm drop and pH-swing steady.