Another vote for the Tyr HA 3/7 Plates.
I have the 10x12 size. $340 each plate is the good guy price.
IIRC, mine are 3.7 lbs and with the cordura cover, about 0.7" thick.
Could you have a tailor modify your existing armor carrier to fit plates?
I could, but then I would get charged for the cost of the vest at turn in time.
How did you swing the $340 price point? Everything Im seeing is closer to $400 apeice before taxes and shipping.