Zack,
It is normal for the safety selector to be unable to switch to safe when the gun isn't cocked. The reason is because the disconnector is elevated, obstructing the selector switch from rotating. DONT force it into safe, always pull the charging handle first.
I'm pretty confident that the issue with the sticky trigger is due to the hammer/disconnector engagement given all the guns I have serviced to date. My suggestion is to replace these parts with stock parts. I wouldn't replace these with steel parts or else you will be putting wear on other internals of the gun. Also, I wouldn't upgrade the gun until you wear out the entire trigger set, since the stock trigger set, albeit made from pot metal, is still pretty durable. If you need these parts, send me a PM, I have a shit load of almost every stock WE parts. The other thing you can do is to send me your trigger box only, and I can make it work flawlessly for you.
However, if you do decide to upgrade to a full steel set in the future, DO NOT get the RAtech trigger box, but purchase the CWI trigger set instead along with the RAtech fire pin and fire pin delay (these parts are good from RAtech).
You can check out my threads here:
http://airsoftcanada.com/showthread.php?t=132679
In terms of the bolt catch not catching, it's very common, even on cav's gun (which I still have to fix). What you can do is mod the bolt catch. Look at my post #920 in this thread:
http://airsoftcanada.com/showthread....ch#post1531174