At first I thought GoldenWolf was a meanie to me, but then i realized that he was actually nice compared to some others. It's just how forums work, you will get used to getting called bad etc. That "Use enter comment" was just a way of saying arrange your text a bit better so it would be easier to read for others, it's kinda bad to throw a brick wall of text at people and just expect them to read everything. Just sayin'.
Although you are better than me at this game there really is no way to magically get better and I feel like i have written that over 20 times already (Some already a few hundred times lol). I also experience finger-lock a lot recently but that is because I almost always use NF to get better and 200+ BPM streams challenge the hell out of me and my tapping speed and precision, it's normal to lock up if the stream is too fast for you to do correctly, although one of the reasons could be that you aren't just used to using two fingers since you used click with a key for a long amount of time.
Single tapping speed just comes from pushing your limits as well as streaming speed and consistency.
TL;DR: Play more challenging stuff and you will eventually get used to the speed and or make your finger-locking go away.