I thought you were using flexible pushrods.
You are using straight pushrods.
This will work better:

Wouldn't the plane be tail heat if I place the servos at the back ?

*heavy

And can you plz share a pic of your rudder.

That plane is long gone! Can't share any more pictures.
Refer to my thread to see if any of those pictures help you.
http://www.rcindia.org/electric-planes/ft-old-fogey-build-thread-for-rci-6-th-sweepstakes/

Did you place the rudder servo just like the elevator one ? And if i place the servos at the back wouldn't the plane be tail heavy ?

No!
You'll just have to move the battery a little forwards. Since you have a 1500 which is much heavier, you should be fine. Infact, the servos at the tail will help you balance.

Are these throws enough at full stick movements ? Pics:https://postimg.cc/gallery/liot8gss/

They should be as recommended by Flitetest.
Share picture of your pushrods, servo placement and control horns please.
Regards

Ok

Here's the pic https://postimg.cc/image/49bfptw6z/

The recommended throws are half an inch. One side is a bit more than half inch.

Is the servo placement fine ?

why this eerie silence ? awaiting suggestions.

Looks quite ok. Go ahead.
Dont forget the screw for the servo arm!

Ok sir.

You can either trim your servos to correct your problem or re adjust the servo arm.

How do I attach the lipo to the plane ? I just have lipo straps but they are too big.

Put hook Velcro beneath the power pod (full length)
And the loop Velcro on the battery. You can move the battery to attain CG then.
Your throws should be according to FT. If they are, then fine.
Are you getting equal deflections both side with that servo placement? If yes, then they are okay. I hope the control horns are installed correctly..... With the pushrod over the joint.
Regards

I am not getting equal deflections . One side has throws a bit less than the other .How to correct that ?

Show me the side view along with the control horn.
In my opinion, the force vector is not straight. So one direction won't be getting full throw.

Ok

Here's the pic https://postimg.cc/image/l319u5ocb/

https://postimg.cc/image/6ju4sssnf/

Pics of Maximum throws at both sides https://postimg.cc/gallery/s1hhmtgc/