The title of this post was "how to get in with lex". The options you listed have nothing to do with lex's game of getting in on characters that dont want you to. Trying any setups or probes or armor while trying to get in will only get you a large punish from any good player. I know all about his setups (
http://testyourmight.com/threads/lex-luthor-mix-up-tech.32436/ ), but against a lot of characters theres just no reliable way to get in besides taking a good chunk of damage before guessing right and corp charging the startup of something or jumping over a projectile hoping they happen to toss one out just as you jump.
How much do you acctually play Lex? I get the feeling that you dont understand how to shut down lex luthors game and thats the reason you think he's viable, but in reality: block a lot of J.3 from him and always respect corp. charge and punish heavily and you will walk all over him. By patiently respecting J.3 and Corp. charge you shut down all of his options of getting in.