I haven't done the front-bag only thing, but I hear you on being nervous about having bags only on the front. But that seems to be a thing lately, as I've seen a few people on the road like that and people here have advocated it. Yet it was always the feeling that if you were going to have only one set of bags, they should go in the back. Maybe endo's aren't a worry anymore?
So, I don't know. It's not like I ever hit the front brake first, so that worry about going over the bars is probably not justified. The funny part is that I use my front panniers on the rear, because the rear ones are so much larger than what I need for a daily commute.