tl;dr -- 33cc 'Tanaka'(Hitachi) 33EDTP and, right afterward, Scheppach CSP2540 (it's one-of-many brands that're thrown on this lil 25cc amazon/ebay special, @$145 it's lasted through some serious usage since last May so intend to get 2nd to reallllly mod like even if it makes i unreliable IE doing it to see how-far-from-OEM I can get it to benchmark :)
Had shaved & edited my OP so many times, hoping to get replies, and cut that out thinking "just general muff-modding" :P Already removed all spark-arresters (no use in FL) and major openings of air-intakes (all filtered so cleaner than OEM but also more air available when it needs it), only noticeable differences so far are noise :P
The unit I'd be modding next, the one getting white high-heat spray on its muffler (to match its new 16" Oregon bar&chain setup and just kinda to see whether high-heats work here) is a
Only have a tach right now and spline-drives, doing almost everything by ear (or by-feel for compression), will get pressure/vacuum gauge and maybe laser thermom when I make my next order though and anything else of-use for chainsaw tinkering if you've got ideas/suggestions :)