The lionsteel sr-1s are pretty good maybe it's just the dpx folders they have problems with?
Do you have one, or are you going on their advertizing? I will never buy anything from them again. You can be certain of that.
In common with all frame locks you have to be careful not to squeeze the lock bar against the blade with your fingertips when opening, many people dont realize they are doing that and get frustrated at how hard a frame lock is to open. You have to hold it in a way that feels a bit unusual at first but you soon get used to it. On the HEST/F I touch the pocket clip with my last 3 fingertips and my forefinger doesnt touch the knife. I push forward with my thumb, not out or up but forward, towards the tip on the front of the scales.
If you're trying to open the knife by holding it as in your photo, I'm not surprised you can't force it open.
If that's your only criticism of the knife, (as it seems it is?) maybe you'll like it more if you try and hold it as I explain in my review:
Hope that helps and you end up liking the knife, or moving on to a knife you like better