Waxy stuff works fine. I use either Rock & Roll or White Lightning. Good stuff. I haven't had any issues with my Wipperman Connex 9x1 chains. After 2 bikes and almost 2 years, it showed very little stretch with the Park Chain Checker. I had to get a new one since it's too short all of a sudden.
wax lubes only work if you know how to use them. when usingwax based lubes (white lighting, ice wax, etc.) you should make sure your chain is clean the first time you use it. clean of all older lubes and what not. then when you apply it, apply it more sparingly and ake sure you wipe off all the excess stuff. you only need lube in between the links cause thats where the real friction is. if you just put it on and leave it then go ride in some nasty sh!t then come back and just put some more lube on it'll turn in to a big cakey nasty mess, that you wont beable to use a degresser tog et off and will either have to spend alot of time with a screwdriver scraping off or toss your chain and cassette....not fun.
i usually go with drier lubes cause they're cleaner and just work better in my oppion. i really like the rock and roll extreme dry or whatever it is (the red bottle) it works super well but you gotta reapply it every other ride pretty much. waht i usually use is prolink. it lasts a pretty long time and glides super well. kinda dirty if you dont get all the excess off but if you do its pretty clean.
if you got just acouple individual stiff links you can probably jsut work them out. grab the chain right at the stiff link and just twist it back and forth laterally to kinda stretch it out. or if you got a park chain tool use the second set of braces on the tool to work it alittle. one of those usually solves it. if not pull out the pin and clean the inside of the plates, maybe take a file to it for like two seconds to clean off any burrs.