This is a problem with the fake alps, because they tend to flex a bit, even when mounted in a plate because of the flimsy solder points. What you can do is replace that switch with a complicated, and also you can grease the stabilizers which will help also. But yeah it's common all boards. What happens is you're leveraging the key against the stabilizers which are on the right side of the key. Greasing them is the best solution.
I have a Siig Minitouch and it is balky. The switches are simplified "XM" alps as far as I can tell. Somebody on here called it "typing on cornflakes" and that's exactly it.
After you crunch through that cornflake at the top of the stroke, there's very little linear resistance between the "tactile cornflake bump" and bottoming out. Yuck.
The resistance varies a lot if you hit the key not quite on center, or if you press not quite straight down. Yuck.
Was hoping this Minitouch would feel like a Northgate. Nope.
This is a review. Avoid anything with XM alps, they're weird.
The Minitouch with any other switch would probably be fine. The enter key is odd, it has a vertical stabilizer but no horizontal stabilizer, and so it may balk if you strike it at its leftmost edge, but the other 2/3s of the key works.
On the XMs, greasing the posts did help. I'm a bad typist, my fingers fall all over the place. Model Ms forgive me. XM Alps don't; grease helps somewhat.
I used automotive bulb grease, which costs 99 cents at autozone:
http://www.supremehardware.com/servlet/the-31094/AGS-BULB-GREASE/Detail