Low Li-7 tune higher on In-115 and U-238 on Agilent 7700

We have an agilent 7700. When we tune our Li-7 is coming in very low (2,300). Our In-115 and our U-238 are higher than before. What levels should we be getting for a 1ppb tune solution?  What is the best method to tune for improving our Li-7 signal? Can we tune just the extraction cell in manual tune?

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