Hey Lizzie,
If you're keen to go low carbs definitely recommend looking at the low carb forum and also look at buying the Bernstein book on Amazon, it looks like a heavy read but is actually easy reading and I found it quite funny in bits!
There is a lot of resistance out there re low carbs, especially among more traditional diabetes people, nurses and docs. One argument is that we apparently need carbs in our diets, I have yet to have anyone convince me why. The ketone argument doesn't stand with me as I've kept a close eye on ketones since changing my diet and they've never gone up.
Like you I had a real problem with spikes then crashes with carbs and this is the only thing that has worked for me.
I get serious munchies between 4-6 and find nuts are a good low carb snack to delay until dinner time.
Looking at my diary I've only had to bolus once today, for a 10g snack mid morning. One thing I have had to play around with is bolusing for protein at times, if I have a large protein load, eg steak (sadly not when preggers though) I need some insulin to cover it but not nearly as much as carbs would need.
Let me know if anything you want to know.
Good luck!
Jess x