Loadbalance + pppoe Server in one router

Hi everybody,
I’m having an issue to program one router as a loadbalance between 8 pppoe clients and get the service out through a pppoe servers for users to control their bandwidth.
at the moment I’m using two routers (RB493AH as loadbalace+CCR1016-12G as user manager).
my problem is slow browsing.
for load balance I’m using nth method as the pictures shows in the attach.
and out interface is connected to the other router to control users.
i need a good method to make it all in CCR1016-12G router to avoid slow browsing as i think.

any help on this matter would help me a lot.
LB2.jpg
LB1.jpg
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