No need for more neg. rear camber, but you have just increased its understeer...so careful until you have become accustomed to it...if you challenge your Beast.
Easiest thing to do to reduce understeer is raise front tire pressure and lower rear tire pressure.
A stiffer rear ARB works.
Smaller front tires or taller rear tires may help.
More front neg. camber would work if you install a front adjustable camber kit.
But if just a daily driver and going for turning heads...the above should be ignored.