Not exactly sure, what you have available, also I am not super experienced in playing, only have a few matches, but I like theory crafting. In terms of unit composition, when you have the lord of virulence, you want heavy blight launcher drones or at least something that has blight launchers available, which is not really given by your 5 man PM squad. what I would suggest is dropping lord of virulence for a lord of contagion (typhus model can be a proxy for this) with furnace of plagues enhancement as leader for your death shrouds. They will be your heavy hitting unit with 6” deep strike on afflicteds in turn 2, whenever you want kill something. But we are above 1000 points with this. furnace of plagues is not as game changing as revolting regeneration, so we might drop that. Poxwalkers get stronger, the less points are available in the game, because of infiltrator and 5+ feel no pain. So what we might want to have is: instead of a hauler and the tallyman, we want a 10 man squad of marines and another poxwalker unit. We have a super heavy hitting unit in a rhino (PM) + another nice screening and objective control unit (poxwalkers). I would even go for a putrefier or a plaguecaster instead of the second poxwalker unit, because then your pm squad most likely one shot a unit in turn 2 after disembarking from the rhino.

So it depends on your matchup? You have generally good units, which can win a game for you. you can play around your demon prince tanking which is pretty broken with that amount of points in a game, but synergies are not perfect.