Personally, I do when I'm on plan. Down to the last piece of chewing gum.
I've found that if I don't, I start to let other things slip and I find that I'm not synning the bigger things thinking that I can get away with it.
If you aren't someone who uses all their syns anyway, not synning a few things won't make a huge difference.
However, I use every single syn 99% of the time, so to not count syns for everything and still use some things each day without adding those syns too, I would go over quite often.
If it's working, stick with it, but if anything changes, start adding those syns on too