Did you ask for all the officer's notes? You have to be specific. It's like pulling teeth with municipal prosecutors. Ask specifically for any of the officer's notes, for both sides of the ticket (officer will usually write their notes on the back of their copy of the ticket), and even for a will say statement from the officer. R. v. Stinchcombe entitles you to these bits of disclosure.
Submit another request for disclosure, asking for these specific things. I would be amazed if the officer didn't write notes on the back of the ticket.
As for the officer couldn't see the white line, isn't he saying that he didn't see you stop AT ALL? In that case, there's no need for him to see the white line, as s. 136(1)(a) covers all those cases where intersections have no markings.
s. 11(b) all the way dude.
Let us know if the extra disclosure offers up anything new.