What are your techniques for 5x5 centers and L4E?

[Silverspeed]

I really enjoy 5x5, but I average about 3:15 or so. I can tell that I could improve if I learned efficient and fast centers, along with faster L4E. Does anyone have any tips/algs for me to use? Thanks :3

 

[sneaklyfox]

tips for 5x5

 

[Lucas Garron]

http://cube.garron.us/big_cubes/L2C/