a few suggestions:
1.Server -> External App -> lsphp5:
the 2 value should match or equal.
you can change PHP_LSAPI_CHILDREN back to default 35
2.first screen shot:
PHP suEXEC Max Conn:5
try change it to 10,20
3.you have 32 CPUs, load is 24, not high. 32 is normal.
4.the real-time stats screen shot:
please monitor the WaitQ column, one is 61. should be 0. or non-zero should not keep for long time.