Do you really want pure flood for hiking? Personally I find that it is not so good for definition.
I do a lot of night walking (I lead groups out in the hills) and many times I descend the hill in the dark if I am out on my own. Like you, I spent time looking at and researching different models. I can highly recommend the Fenix HL55. It's everything I want in an outdoor headlamp. The beam is neutral white, and floody. Not Zebralight floody mind, but a VERY large hotspot with great blending spill. The runtimes are excellent. 10 lumen is good for in and around camp, lasts 150 hrs. 55 lumen is good for well defined trails and paths, and also in woodland. What I really like though is 165 lumens for 10 hours. This level of light, in neutral white, for this time period, is SUPERB for difficult pathless terrain such as rock, scree, open moorland etc. I do not use the 420 lumen mode as it only lasts 3-4 hrs (which come to think of it is quite a lot!) but I have to guarantee to myself that my battery will last the night. I do though, very occasionally blast the hillside with the 900 lumen burst if route finding becomes tricky.
It is an outstanding headlamp for outdoor pursuits and in 25 years of using these things, I have not found one better. I have used Petzls, Princeton Tec's etc and they just don't come close. But I will tell you what is also clipped to my chest - a Zebralight for close up map work....pure flood works well at close range!