Zn/Mo/Ni low recoveries

Hi all, I am currently in the process of creating and validating a method for a soil digestion on a 7800. Most of what I have has been running fairly well, but a few elements have been giving me some issues with low recoveries. Zn, Mo, and Ni are all coming up just short of 90% recovery. For the most part they run 80-85%, but I do need it to run at least 90% for my initial QC check. I have played with both modes available to us currently (No gas/He). Any insight on the lower recoveries?

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