Borderlands v1.2.1
 

I've made a +3 trainer for Borderlands v1.2.1.
Please help me bug test it.

Also, if you can give me a hand with the Shield and Health values that would be great.
I've found the float values, but locking them turns enemies invincible as well.

If you know of a common method to bypass this issue, this information would be highly appreciated.

Tutorials for beating DMA and splitting player from enemy are very common. You'll find them on various sites such as gamehacking.com

It's more than people will be willing to do a whole post about, so you should try there and start reading.