Ratlines undeniably add windage. Having gone up both weather (very easy) and leeward (pretty easy) ratlines on a small (20 ton) schooner in a Strong Gale (F 9, wind about 50 kt) and having fooled about with various ascenders and halyard hoists in considerable gentler conditions, I am sold on the ratlines for any solo work and even assisted for most rough weather work.
As for the question about Dynex, however, I've no clue except that a boat employing Dynex is unlikely to be of a rigging type where ratlines make much sense anyway.
G'luck
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