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I am thinking about doing the same for my nem tank with retro t5 + two mars aqua LED. The reason I have not done it is because I think two bulbs retrofit is not strong enough, which seems to be the case for you. But the cost of buying 2 sets of retrofit kits is close to getting a decent used ATI...
There is a thread on R2R that has the triton test result for most salts on the market. For an estabalishing reef most of the salt will work because whatever excess alk and calcium are quickly consumed by the growing corals. However for a new reef that does not have a lot of alk demand yet it is...