No plastic trailer for me in clear water. I fish War Eagle spinnerbaits exclusively and half of the skirt on them is cut long, providing a built-in trailer of sorts. Many times I'll even trim that part completely off for a more compact profile. It's easy to overwhelm fish in clear water.
Trailer hook depends on the cover I'm fishing around. This is mostly a spring thing, but if I'm tossing my blade back into the bushes or other wood cover, I don't use a trailer hook — even in a derby. Neither do I use one when working a blade over and around cedars, like we often do year-round on TR. Nothing is more infuriating to me than to make a good cast and have it ruined by the trailer hook snagging on a limb. As few fish as I've missed or lost over the years for lack of a trailer hook, I'm not willing to take the chance of spoiling a promising tree or stretch of bank by having to barge in and get my hung-up spinnerbait loose.
That said, if I'm fishing rocks, dock corners or other solid cover — even sparse wood — I'll generally use a trailer hook in a derby. Never when fun fishing, though. As Fat Boy said, they'll sometimes get that stinger hook deep or in their gills and no sense in taking a chance of injuring or killing a fish for no reason.
The retrieve speed question is just a matter of experimenting. When water temps are above 60, I usually start with a medium-fast steady retrieve, keeping my bait about 3 feet deep. I may flutter it occasionally around cover, but for the most part I keep it steady. I know that KVD strongly advocates an erratic retrieve and that obviously has helped him win millions of dollars, but over 30 years of developing my style of spinnerbaiting, I've come to favor a steady retrieve.
Hey Edwin, hope you get some wind or cloud cover this weekend. If not, could be tough going. Might try pitching a little jig down into the hearts of the cedars or in boat slips with 10-20 feet of water under them. I'm sure there's some kind of drop-shot bite around the deeper docks, too.