Hi Tanya and Wilson. Welcome!
Most of us use syringes for measuring doses as they are probably more accurate and you can fine tune the doses better. We normally do dose adjustments in increments of 0.25 of a unit at a time. So, if you can find a way to order U100 syringes with 1/2 unit marks that would be ideal.
Also Lantus works best when given consistently, meaning the same dose every 12 hours. It is because it is a depot insulin, unlike the other types of insulins and consistency in dosing is how the depot works best.
I'm glad you are home testing. You will need to test more during the transition to all wet food. Yes, all wet food is best for any cat, diabetic or not, but especially for diabetics. I'm glad he has gained some weight back. If you post here often, daily if possible, we can help you to get Wilson's numbers better under control. That will help with his neuropathy. Here is the link to your previous post:
http://www.felinediabetes.com/FDMB/threads/help-cannot-get-diabetes-under-control.190191/ Others will be along to support you and help with your questions. In the mean time, read the stickies at the top of the page (there's a lot and it can be overwhelming, so take you time), and try reading some of the other threads (condos) in this forum.
For now, here's a

You're doing the best you can for Wilson.