You deep cleaned it, did you replace the thermal paste? If you did, what did you use? If not, I would recommend doing so. Kryonaut Thermal Grizzly, Noctua NT-H1, or Arctic MX-4 would all be a good option to use. Also check the thermal pads on the ram and mosfets/etc. If they are try, cracked, flaking, or covered in dust or debris, replace them. I think they need 1.5mm thickness but I'm not 100% sure off the top of my head.