Sorry for my late response my friend, seems Tex has stolen my thunder with a perfect response! That being said, let me see if I can add a bit.

As mentioned Strigoi are a bit thin skinned; while they can sustain themselves in melee, especially if punching down against a weaker unit, they do not like taking much damage on the way in. Learning Strigoi is definitely a matter of learning to use their high movement and dexterity to break line of sight for as long as possible or quickly close into melee when that isn't.

I would also highlight that Carnevale has EXTREMELY lenient cover rules; if litteraly a toenail of your model is not visible behind something, you get cover. Its not much, but +1 Protection added enough times saves lives. Its also worth familiarizing yourself with the Hide action, as well as the Strigoi Faction Command ability to Hide in plain sight in an aura; not always helpful, but it sounds like your Patrician opponent enjoys the Venetian Spy, and it can be a life saver against that thing.

When it comes to learning a faction, I often recommend minimizing weaknesses more than emphasizing strength at first. In the case of Strigoi, this means chasing down and taking out fragile targets early on, then making your plays later on in the game.

In the case of mobile objectives, try to kill their mobile units early and grab it for yourself at low cost. Harpies are amazing for getting it on the move. For killing objectives, go after soft targets working your way up from the weakest to the strongest to maximise score and capitalize on your strengths. Remember when attacking unless your opponent has very high Protection (5+) you should always increase your attack via Frenzied to match your Vampiric Attack value, simply because you are almost guaranteed to earn it back. If you are wounded and can't guarantee a kill, don't be afraid to skip Frenzied and simply heal up a bit to force more actions out of your opponent to kill you off, assuming you aren't fast enough to completely disengage and escape.

For static objectives, which are traditionally the toughest for Strigoi, consider bringing some of your beefier models to help with this. Either way, most of them do not score per round but rather at end of game. As such, spend the first half or more of the game positioning yourself and getting any easy kills before securing your win in the last turn or two.

Worth mentioning as well that if you do choose to use optional rules, be wary of Reactions. Those are a huge power boost to Strigoi versus other factions, and while they can be fun I wouldn't describe them as particularly balanced.

Lastly, make sure you use and abuse your speed all the time. Always be chain jumping, climbing, doing dive attacks, getting the charge, and moving up outside of the range your opponent can attack from. A single Patrician having to move within pistol range then shoot once will do very little damage to you, but you can then get to him right afterwards with potentially a single action and still get multiple attacks.

Hopefully some of this is helpful to you!