For tight complex bends i fill lines with sand, then blow them out after, brake cleaner and blow again, sounds like work, but it makes for very nice bends.
The deluxe kit sounds nice but hopefully I won't be doing this again, so gotta make the cheap one work lol. Also I probably won't do the sand in the line but I would love to know the reasoning behind doing this and how it helps. It's good to have extra knowledge tucked away as you never know when it might come in handy