Sure you need pbr routings.
The redirect rule usually works but is overly complicated and sometimes causes problems so why use it.
About the MTU there is a first for everything but I have never seen that an MTU lower than 1000 was necessary
P.S.
If your problem is solved, please consider marking this topic as [Solved]. See How to mark a topic as [Solved] for a short how-to.
Thanks! 