In what instances to kibbud av v'em apply to a parent who has become less religious?
For example, of the following points, which battles are worth fighting?
As always, CYLOR.
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There's a general rule that if a parent asks or makes you violate any halacha, you should not listen to them. As you know, within halacha there are interpretations, minimal requirements and leniencies. You need to have a clear understanding of how these work for each action and situation. So, while I have mentioned a general guideline, there si no tacit answer for each situation.
You are obligated to treat them with an attitude of respect, and speak to them respectfully. However, you should still keep shabbos, kosher, and the like, despite their wishes to the contrary. (When it comes to something like a custom or chumra, it can vary.) That means saying "I love you mom, but sorry, I feel that I need to eat kosher", not "mom you apikorus, you're going to gehenom for eating that treif!"