ROS 6.5 Beeline IPSEC over L2TP - mtu problem

Hello All.
I’ve setup lan-2-lan IPSEC tunel over L2TP line from Beeline (Corbina).
Tunnel looks fine besides the fact that http traffic doesnt pass correctly.
I can use telnet / ssh via tunnel , also http port is open.
All this gives me the idea that something is wrong with MTU.
I was trying to setup MAX MTU/MAX MRU of the l2tp interface down to 1350 - no luck.

Hey ppl, Does anyone of you has real working example?
Any suggestions? Should I edit MRRU or change some other settings of the ethernet interfaces?

Thank you in advance!

http://networkcanuck.com/2013/06/10/troubleshooting-mtu-size-over-ipsec-vpn/