I just finished a >whole runaround< of the same thing… apparently before any instruction updates were availed, but basicly exact same issues you are having now.
I ended up going the wiringPi way of installing Blynk (no NODE or ONOFF necessary). I have asked, but not yet received any feedback if this is a good, bad or ugly option… but it was a quick install and works.
So far I am just messing with direct pin access and have not yet made and scripts/executables… but it has been my best way to enjoy Blynk on the Pi so far 
Here is the link that shows the steps.
And the link for the home of >wiringPi< for reference.