i`ve been using systemd for a while now, and found out that when
using NICE parameter for .service files the varible is not set correctly.
i`ve found the problem in file *load-fragment.c* function
*config_parse_nice* variable /*c->nice_set = false;*/ should be
/*c->nice_set = true;*/
Problem is alsom manifesting on v17 but did not upgrade yet ...