Hi and welcome, Beer Connoisseur. Like the name!
You asked, Have they gone beyond what is written? (1 Cor 4:6). The answer is yes.
I posted this recently on another somewhat related thread, "Ghosts and using God's name":
Proverbs 18:10
The name of the LORD is a strong tower;
the righteous run to it and are safe.
The name is used figuratively. Compare with 2 Samuel 22:3,51; Psalms 18:2; 61:3; 144:2 and you'll see it's not advice to invoke "Jehovah" as ammunition against "wicked spirit forces." It's about how Jehovah protects the righteous, those who keep his commandments, and is figuratively, a place of refuge.
At the time this was written shepherds used towers to watch over their flocks, and would herd the flocks into the towers for protection. Also at that time, the name of YHWH was not uttered out of respect for the divine name. The average Hebrew was probably not using it as a talisman to repel demons. Just my opinion.
The Witnesses have an unhealthy obsession with wicked spirits (as well as the name Jehovah). They use this as a mechanism to keep you studying with them... if you stop, you will have demon attacks, so say this magical name and they will flee. Anything that keeps you from getting baptized is the demons fault, and anything bad that happens after you're baptized is the demons fault, too. It's control through fear, and a copout to avoid taking any personal responsibility for their lives. It's very sad and very effective.
What's interesting is that the Hebrew scriptures don't really mention demons or demon attacks, though Jehovah cruelly allowed Satan to mess with Job. The demons were busiest possessing people when Jesus was on the scene. Later, his apostles were able to drive out demons with the aid of the Holy Spirit sent to them by Jesus. Jehovah did not figure in.
BTW, Jesus didn't call on Jehovah, he used Abba, Father.
~Sue