Sigbench will show you the percentage amount of difference between the old default dll and your junkprotected dll.

You need JAVA for this. Install this if you haven't already https://java.com/de/download/

Download Sigbench: http://www.mediafire.com/file/6k0mh81gf3y4vqg/Sigbench_%255Bunknowncheats.me%255D_.zip/file

You need your Junkprotected DLL (without vmprotect or themida) and the default DLL (Without Junk).
Open Sigbench. Drag&Drop the protected dll on the left and the default on the right side of Sigbench.
Change the Sig size to 16 and press Benchmark. This can take a while (up to 5 Minutes if your PC is garbage).
Do this step 5 times. If the average is below 45% you should add more Junk. Average +50% = decent. Average +75% = good, your safe.

It should look somehow like this: https://imgur.com/6kOpTCv