How about:
Don't Do it Because They Are Now Prosecuting People Caught Smuggling Steroids At The Border Instead Of Just Giving Fines Like They Used To."
That being said......only bring back a small amount of gear, enough for one cycle. Even though NOBODY just does one cycle lol, and you probably feel like brining back enough for more, only bring back a small amount of gear. This will allow you to hide it easier, reduce the penalties if you are caught, and keep you from getting cocky and thinking smuggling is easy and then getting caught with a big load and end up in prison

. As for more specific than that.....couldn't tell you, never done it before.
P.S: TJ is a real hotspot, tons of guys get turned in by snitches who either own the pharmacies or see you coming out of one. San Diego is where most of the gear enters the U.S, and the Feds know this, so you probably should smuggle it out of somewhere else. If you are going to SD for like a vacation or something, just have fun, try getting it out of somewhere else safer like Juarez.
And driving across the border in a rental car is a good way to get attention, which when smuggling is a bad idea.
***My final advice is to not do it, however. Gear is not worth going to jail for.