Why not take some more qualities to flesh the char out a bit more? also, a full arm shouldn't be 1.25 essence unless it's like, secondhand.
Fake Licenses 5 and 6 are above your avail, if you're going standard avail.
Thirdly, you're doing the customized strength wrong. You would need enhancements to get your strength to 5, for instance. Customization just allows your cyberarm to take advantage of your body's natural physique, as opposed to increasing any stats.