I found there is definitely a "proper way" to succeed with winds in FSX, Microsoft have no worries; all aspects of FSX weather work extremely well, its all about how it’s done. You will not find the nasty transitions in Ideal Flight weather, even when ascending into a 100knt jetstream.
Ideal Flight generates a global weather simulation, introduces its own weather station patterns, sets up proper merging routines, smooth’s wind transitions, and creates complex visibility. Realistic sky views are computed for cloudbase/temperature/dewpoint/time of day/time of year/location and so on.
IF also has the most advanced auto flight planner with TOC/TOD, which also accepts any .PLN, a comprehensive briefing, and even in-flight functions like Goto Next Waypoint, but that’s another story…
Best regards;
Steve