Very interesting Rose!
I agree with most you said above.

I think it is hard for people in general to understand Bates easily because he is so mysterious and stoic. I think that Bates tries to make up for his past mistakes by up-holding a self-imposed strict code of conduct. I think we have also to remember that his drinking problem started after he returned from the Boer war and that he went to prison too, so that may have give him a lot of time to do a serious in-depth self-evaluation and Bates may have felt ashamed that he let himself down (via drinking) and this may have led (to his belief) Vera to steal the regimental silvery. I think that Bates still hasn’t quite over his mistakes, though he won’t admit that, but his behaviour & beliefs (about honour, etc) and kind of masochistic self-punishment leads me to belief so. I think that he tortures himself over Anna, it is almost like when someone is fasting during Lent and they have to endure the temptation of eating whatever you promised to give up for Lent. Maybe Bates is Catholic and may try to redeem himself by putting himself through those painful trails.
It is also possible that Vera may shed some light on Bates’ past or that that Anna may pay another visit to Mrs. Bates (mom)
Maybe series 2 shed some light on the fact that Bates still gradually recuperating from his war experiences. I think that PSTDs would have being particularly hard to overcome since it wasn’t yet recognised as a medical condition thus making it harder to cope with and help to cure it. (maybe Bates found his cure in the booze).
Inferring from the podcast, I think Bates will still take the same line of approach he took in series 1 in relation to Anna to series 2. The only difference is that Anna will possibly know somehow that Bates does reciprocates her feelings but is stopped due to his code of honour and the thought of Vera coming after him may also prompt him his desire to protect Anna from his wife.
I also think that Bates is a very proud man and likes to hold himself up honourably rather than having others to pity on him due to his limp (that is how I think Bates may view others’ concern for him.)