Just got MK3 heatbed, have questions.

[DBFIU]

I believe some people have had luck going through the process of calibrating the PID factors for the bed. Sounds like you've already got pretty robust wiring. Short of the PID tuning, your next option may be to use a 12V automotive relay or a solid state relay as a more efficient switch for the heater power. The MOSFETs used on RAMPS aren't exactly the best possible switches, and you lose some power in the on-resistance of the MOSFETS.

Hi dude again, I just ordered a 350 watt mean-well power supply and a 25 amp solid state relay off ebay. I will be running this bed on 24v through the relay. I need this bed to get hot quick and stay hot/uniform.

Do you have any other suggestions other then what I am doing? Does a SSR suck up lots of power, should I use a mechanical relay? I think my PSU is overkill, but I need it. I have 3 production machines that my business depends on and these beds just take forever to get hot, time = money. Thanks again