1)I use both the 8" and 10 or 11" flashers. I run SD's, Fish Catchers and DW Paddles. More often than not its the 8" off the dipseys simply because theyve treated me so well there and the bigger paddles on the deep riggers for the very same reason. Nothings set in stone though, i may run a big paddle up on the dipsey as well. I have no preference, just the one the fish have that day.
2)I use my SD's in the fin hole
3)Most times on my 8" flashers im running a 22-24" leader from tip of loop to bend in rear hook. I may go another foot if thats not going. As far as the 11", ill run them 30-36" range and may go all the way up to 50". Just listen to the fish.
4)You can run them out 4' if you want, but youll probably have a bit more bounce to the boom. Probably why they recommended going shorter.
5)Braid is commonly used to deploy dipeys, can be used on a pump handle set up and is used frequently to back lead core.
Its thin diameter allows you to get ample backer of a higher # line on a smaller sized reel compared to using thicker mono as backing for lead core. I generally run 250-300 yds of 30# power pro on my 27# lead core with a 40' section of 30# mono in between the power pro and the lead core for attaching to the planer board. I use a back to back uniknot for the power pro to mono connection and the willis knot for the mono to lead core connection. On the business end of the lead core i drop down to a 20' piece of 20# leader for attaching my lure. The reason for stepping down in # line as your go from backer to core to leader is to lessen the chance that the backer or core will break, but rather the lighter leader. Thus, youd only be out a lure instead of a whole lead core.
And because braid is thin, its a great choice for the dipseys as mention. Will get ya pretty darned deep. Often times in a multi dipsey set up per side the inside rod or low diver will have wire. Dipsey will likely be set at 1-1 1/2. The outside or high diver will be set at 3-3 1/2. This will allow you to comb several layers of water with the dipseys. Of course if your only running one dipsey per side then you can set them wherever youd like. But when running multiples per side i like to keep them at least 2 1/2 numbers apart on the settings to reduce the chance of tangling.
Im all for keeping you in a job, but the USPS is not cheaper here by any means on some items. I use the USPS allot as i live right next door and my Dad leases them the building, but on any items that are of any size or weight theres no comparison in price. Shipped two deer feeders to Arkansas and there was a significant difference in price for tracking, ins. etc. Original price was cheap, but by the time i added tracking, ins along with the oversized box and weight charges it was no contest. Not trying to stir the pot just saying. Id rather use em, as theyre more convenient for me, but they just make it hard to on items like that. Ive also had some issue with tracking items that ive purchased. Other than that, i love the smaller priortiy boxes, its a great way to ship items.