The point of putting down some black electrical tape is to provide some grip between the line and the spool. Plumbers tape is teflon, i.e. slippery, which would be counterproductive. Not saying it wouldn't help, but electrical tape would work much better.
I put down enough mono to partially fill the spool so that I only need 150 yds of braid. It's cheaper that way, and 150 yds is plenty for inshore fishing. I temporarily put down the 150 yds of braid first, then top it off with enough mono to properly fill the reel. Then I unspool the line and put down the measured mono first followed by the braid. An FG knot, once you know how to tie it properly, can't be beat. It adds virtually no diameter to the mono and is virtually 100% knot strength. For inshore, I use 10# PowerPro and 12# mono backing along with a 20# leader and have never had a break-off from a fish. I did snag a huge turtle once who wouldn't let me get close enough to unhook it so I had to break it off which was hard to do. It broke off at the terminal tackle knot, not at the 10# PowerPro to 20# mono FG knot.
When putting braid on a spinning reel, allow the braid spool to spin on a shaft as you spool up the reel. Yes, it adds a few twists to the line on the spool, but those twists are undone when the line gets casted which is what's important.