Been flying with the slow stick stock tail for some time now and after I crashed it, decided to try the V-tail setup.
Bought the V-tail mount from radicalrc. Was easy to set up the tail, just split the elevator in half and mount it on the stick.

After two flight attempts with the new tail my slow stick is a total wreck now. On both occasions the plane went into a hard left dive and I couldnt straighten it out.
I thought maybe I set up the controls wrong. The controls are as follow:

stick right -> right ruddervator comes up and left ruddevator goes down.
stick left -> the opposite of above
stick down -> Both ruddevators down
Stick up -> the opposite of above

Is this right??

The ground handling was weird too. The plane tended to veer to the left, but when I countered this by turning right it only made it worse.
Turning to the left straightened it out, as if the controls were backwards.
To me it makes sense that the sufraces would work similarly to aelerons, after two crashes I'm not so sure anymore

With stock tail the plain did veer slightly to the left, but it didnt really bother me. Was maybe misaligned elevator or something with the main wing.
I'm thinking if it was the main wing and the V-tail make the plane more unstable it could possibly cause the left dive that it does.
I'm just guessing here...any ideas?