Nobody can tune this for you via emails and posts like this. There's just too many variables that we can't see or know.
First I'd ask --- how do you know when it's "too lean" and how do you know when it's "fat/rich"?
What A/F ratios are you trying to achieve? And are the VE's all set?
Is there an idle control motor?
What's your vacuum look like...
What's your timing - initial - total - what's your curve?
Are you running sequential or batch fired?
What size injectors are you running? What PSI is your fuel pressure regulator set to deliver?
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