I'll do this in Imperial even though my data is in Metric.
I don't do imperial, so I'll answer in metric...
I'm about the same height as you and a few years older. Having been overweight for most of my adult life (getting on for 90kg at my heaviest), when I hit my late 30s, I decided I needed to do something about it so went on a fitness drive - started counting the calories and doing a lot more exercise. By the time I turned 40 in 2012, I was down to 67kg and the fittest I've ever been. I did get a few comments on my appearance but I wasn't 'skinny', I was healthy. I was riding loads and eating pretty much whatever I wanted - generally preferring healthy stuff and keeping an eye on the overall calorie intake, as well as moderating my alcohol consumption, but not avoiding anything in particular. I did for a while entertain ideas of getting down to 64kg, but it would take pro athlete levels of dedication to reach that and stay there. The thing is, while my weight initially tumbled rapidly, once I got down to below 70kg, it became much harder to continue losing weight - it seemed to reach an equilibrium at around 67-68kg.
After a difficult few years, I'm back up to 79kg and definitely not fit. I'm not sure I'll ever get back to 67kg but I reckon something in the range of 70-73kg would be a good target - which is around where you are now, right?
I don't think you need to worry about losing a bit more weight - as long as you're otherwise healthy, you've got a long way to go before you're getting dangerously thin. You may well look skinny compared to 'normal' people, but that's only because being overweight has become normalised. You need to enjoy being at a good, healthy weight. When I was below 70kg, I loved the fact that I could get into 28in waist jeans for the first time since I was a teenager, and I loved all the attention I got from women (not that I did anything about it, being happily married).
So anyway, my advice is not to worry about it. You're fine. Keep on doing what you're doing. Keep eating healthy foods. Keep riding lots. Your weight will stabilise eventually.