Well, that makes sense now. Let's try with these settings:
monitor_specs0 15625-15900, 40-59.97, 7.800, 4.700, 10.600, 0.190, 0.191, 1.018, 0, 0, 248, 448
monitor_specs1 15625-15900, 60.00-80, 3.000, 4.700, 7.700, 0.190, 0.191, 1.018, 0, 0, 248, 448
monitor_specs2 16000-17200, 58-80, 2.187, 4.688, 6.719, 0.190, 0.191, 1.018, 0, 0, 256, 448
monitor_specs3 18300-18800, 40-58, 8.300, 2.750, 9.000, 0.190, 0.191, 1.018, 0, 0, 280, 448
monitor_specs4 18800-19000, 40-80, 2.187, 4.688, 6.719, 0.140, 0.191, 0.950, 0, 0, 320, 448
monitor_specs5 24000-29000, 40-80, 2.020, 2.820, 6.460, 0.890, 0.148, 1.373, 0, 0, 384, 576
monitor_specs6 30000-34000, 40-80, 0.636, 3.813, 1.906, 0.020, 0.106, 0.607, 0, 0, 496, 768
monitor_specs7 34001-38000, 40-80, 1.000, 3.200, 2.200, 0.020, 0.106, 0.607, 0, 0, 600, 768
Now the 15 Khz range is divided in two ranges depending on vfreq, the limit is 59.97 Hz, let's see how it works.
Try toki, snowbros, bublblobl (< 60 Hz)
Then try goldnaxe (60 Hz)