FlowTimer 1.7.x inaccuracy research

jre8, r649, crystal practice rom, offset=12900, on press, ping1
1.7.1, darkmode disabled:                   [63, 64, 62, 63, 62, 64, 63, 64, 63, 64, 62, 64, 63, 63, 63] => avg=63.133, sigma=0.831
1.7.1, darkmode enabled:                    [61, 61, 61, 62, 63, 64, 65, 61, 64, 61, 59, 62, 64, 61, 62] => avg=62.067, sigma=1.521
1.6, visual cue disabled:                   [63, 63, 64, 63, 62, 62, 64, 64, 63, 64, 63, 62, 63, 63, 63] => avg=63.067, sigma=0.804
1.7.1, darkmode+visual cue enabled:         [61, 64, 58, 63, 65, 66, 62, 62, 63, 62, 63, 61, 62, 65, 66] => avg=62.867, sigma=1.950
1.7.2, visual cue disabled:                 [62, 62, 62, 63, 63, 61, 62, 61, 61, 62, 62, 62, 63, 63, 63] => avg=62.133, sigma=0.831
1.7.2, visual cue enabled:                  [63, 63, 63, 61, 61, 62, 62, 61, 61, 62, 62, 61, 62, 63, 62] => avg=61.933, sigma=0.870
1.7.2, visual cue disabled, timer disabled: [62, 62, 62, 63, 62, 62, 62, 62, 62, 62, 62, 63, 62, 62, 62] => avg=62.133, sigma=0.597
1.7.2, visual cue enabled, timer disabled:  [64, 64, 64, 65, 64, 64, 64, 64, 63, 64, 64, 65, 64, 64, 64] => avg=64.067, sigma=0.651
lol. todo: more testing