Here is what I would recommend if you do want to think about more oblique work or even if you don't:

Basically for all assistance work including abs on a 5x5 what I like is instead of using similar loading parameters as the main exercises use a double progression. This will allow you to get a lot of work in but without the total volume going to the moon...so that you can throw in a little oblique stuff or whatever without too much fear.

Basically do what you're doing but just concentrate on increasing the reps until you're doing 10-12 (whatever you like) then raise the weight and lower the reps and repeat. I think this is the best method also to employ for the arm work..I normally like to start with 6-8 and go to 10-12 before moving up the weight. Very successful with that. It's important to keep in mind that assistance is assistance and not about setting any records but this is an easy and very effective way to run it.

Having said all that what you're doing is fine but the reps are a little low for my taste. Not in the context of abs but just in the context of assistance work.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.