'+2 High Roll Centre' on DEX410

[Chesty]

Is there any reason why every set up sheet for the DEX410 uses -2 low roll centre on the rear front suspension hanger?

From what I have read & now tried the +2 high roll centre appears to 'lock in' the rear end... There seems to be more mechanical grip at the rear.

I've always struggled with the 410 rear end being a bit 'loose'.

Any input would be appreciated?