Womble outputs atrocious quality when it exports HD material. You really need to think about using another editing program if you want to edit in HD.
I suppose you could export a lossless AVI from Womble and then encode that with MeGUI or something. I have never tried it though.
Moreover, if you are keeping full HD resolution, I recommend you encode to at least a DVD-9 size. A DVD-5 will not cut it.
You might want to check out adigitalman's (DVD) extended edition of TPM, if you only want a pure extended edition. It might have done your work for you. :-)