With your current AGM setup you could support ~5000w comfortably after amp efficiency. With 120AH of Yinlong with the same alternator you could support ~10,000w comfortably. Obviously you can't defy the laws of thermodynamics so you would eventually drain the lithium bank if you draw 10kW for like 5 minutes straight. But after impedance rise you will probably only get 4-5kW out of the 8k amp, and maybe 3k total for both 3k amps. So I bet you would be totally fine.
95mm2 should be PLENTY thick even if it's CCA wire (about 3/0 gauge iirc). This chart is for OFC wire, so you would want 1/0 minimum for a 150A alternator.
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