A "preamble" is a necessary part of any U.S. claim, and must be included. However, I think you are lumping the so called "Jepson" preamble specified in 37 C.F.R. 1.75(e) (i.e., "An XYZ having ABC elements, wherein the improvement comprises:" with a generic preamble, such as "An article, comprising:"
In the U.S., Jepson claims are never required if an application is drafted appropriately. And I would wager that most patent attorneys would agree that Jepson claim format is not desireable or widely used, despite the fact that 99.9999999% of all inventions are derivative, i.e., an improvement over something that came before.
Also, I would not use at least two of the section headers you mentioned, i.e., "Ramifications" and "Scope of Invention." The latter screams prosecution disclaimer/history estoppel. The former could be construed as providing a hard and fast characterization of your invention which could be later used to limit the scope of your claims.
I would stick to very general section headers, similar to those suggested by the PTO, i.e.: Abstract; Field; Background; Summary; Brief Description of the Drawings; Detailed Description. If you need to include the "ramifications" of the invention, present them in a non-limiting way (I can already see Jim's ear's pricking up at this). For example, if one benefit of an invention is that it improve the efficiency of an electric lamp by 15% or more, I would present that as "In some embodiments, the [insert idetnifier of the invention] improves the efficiency of an electric lamp by at least about 15%." If the language in the specification suggests that in all instances, an invention results in some improvement, it is possible that a court could use such a statement to interpret the claims of that application as only encompassing embodiments wherein that improvement is obtained.