Bonding 2 wireless links throughoutput as one link

I am bonding two wirelless links. Each links has throughoutput 50mbit/s. They are bonded using balance-rr. When I test throughoutput of bonded link it has throughoutput less than one link throughoutput, less than 50mbit/s.
I used this manual to create it:
http://wiki.mikrotik.com/wiki/Bonding_Examples

Also another paradox is that sublinks has latency 0ms. But bonded interface has more than 10ms to 30ms.
Why?
bonding.jpg

balance alb : 34mbit/s dropping to 4mbit/s, but better latency…

Now I noticed that when I do bandwitch test data goes only through one eoip tunel. Why?