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Just updated my system and need to know Max Charge Rate I could use
Solax SK-SU 3700E Inverter
4 x Lg Chem Module 126AH - 6.5Kw Batteries

Was and still am charging @ 40A, is this correct or can I increase the Charge Rate?

If these are your batteries (linked below) they should be able to charge up to 63A each, but your inverter (Solax SK-SU 3700E) only goes up to 50A charge rate so you don't have much more headroom to increase.
https://www.google.co.uk/url?sa=t&rct=j ... 2DlMhI4HSj

EDIT - Subject to your cables and fuses being appropriately sized.