Yes, you're right, however I changed the lower limits check and now depends on the VirtualLinesLimit/2 value. The fix for this is in the to-do list. By now, you can use this workaround:
monitor_specs0 15250-15700, 49.50-65.00, 2.000, 4.700, 8.000, 0.064, 0.192, 1.024, 0, 0, 288, 384