I am willing to bet you are too far to get the H simulcast. The new system, from my understanding is much more focused on coverage within the troop boundaries, i.e. Troop H is designed to cover just Troop H territory and not much more. Troop H is under a state wide license that doesn't list specific sites, so we don't know exactly where every site is, though they probably reused most of the old sites. However if it anything like Troop C the power is reduced to cover only Troop C, i.e old Moto System max ERP was 220 watts vs. P25 system is max of 126 watts.
Not sure on the HP-1, but you could use "Discovery Mode" on your 436HP and start a new session and select the Troop H Simulcast and see if you get any bars and a DAT indicator in the lower right hand side of the screen. If not you aren't able to receive the control channel. Also, you could program 774.53125 as a conventional analog channel and see if you can hear the control channel. If neither of the above are successful, you best bet may be to listen to Troop I and maybe get lucky someone from H has affiliated to a I cell.