The influence and perks are 4 byte exact value. The only reason I would see this not working is if you are changing zones. Each time i did it successfully I believe I was in the same zone. On that note though, there is not 1 concrete value that i edited, after scanning you should come up with 6 different addresses but all with the same value. After changing all of them I believe it should update your influence automatically (can't remember for certain if you need to gain more influence in-game for the update to show).
As for the perk points just go to war room and scan for the number you have 19 if at 20 influence then spend and scan and like influence you should get 6 addresses same value again i just edited them all to desired number.
I didn't change zone, I did find 6 values, changed all when I got more influence it reverted back and gave me the amount I would've been at if I hadn't edited anything.