switching fertilizers!!

[orchid-asmr]

hello all!
I am currently using a fertilizer brand called Grow More (20-20-20). I have noticed that once in awhile i would burn my orchids roots with this especially when it started to get clumpy (its a powder). I assume its because moister has gathered in the container somehow and now the salts have a accumulated and harder to mix in the water. As much as i hate myself for it I do use tap water which in soCal is probably heavy with calcium and magnesium and this fertilizer doesnt have calcium or magnesium which im happy about, BUT it does use urea as its main source of nitrogen which i have heard is not good for orchids as it doesn't go through the nitrogen cycle and properly break down for them to actually absorb it which is another reason why i think my orchid roots are burning. And this is why I am looking for a new fertilizer! I want to try the MSU FEED ME! (13-5-15) by rePotme.com but it has an 8% dosage of calcium and a 2.6% of manganese. Do you think it would be ok even with the extra calcium? Or does anyone else have any other recommendations!

Also sorry if this is not the right thread to post this! im not too sure!