Balancing pptp tinnels

I have 7 pptp tunnels speed on 256 (7 pptp tunnels). Users receive the Internet through NAT (each user in the subscription). As to me to make we shall assume 4 subscriptions, but with balancing on loading the channel. That 4 channels have been completely loaded?? Presumably from 7 maximum work 4. Help please
The scheme to be here
http://pptpd.narod.ru/photoalbum222.html

Please explain your problem in simple English. Also share exports from your config :slight_smile: