It largely depends. I'd say that generally speaking, you shouldn't be going Hourglass->Deathcap->Morello. And they're not ideal pick-ups across the board, especially if you're not playing Lissandra aggressively to make plays with her initiation with the Hourglass. Like, Hourglass isn't the best pick-up if you're not utilizing the item for the opportunities it presents when you can be getting, say, Haunting Guise or Abyssal early and play more dominantly in lane and build up a bigger lead. Especially of note with how low the cs is that you need to be making the most out of what little gold is there.
It's not a primary thing but it's definitely worth noting. Especially since it's about all I can really comment on given lolking info.
Edit: But, yes, I'm working under the assumption of "same build every game" to mean "not reading the situation." Likewise, just the whole "hard to carry games" tone makes me think of lack of attempts at making plays which is one of the core reasons you get Hourglass on Lissandra, especially if you're getting it vs an AP lane like almost all of those situations are.
Oh no, it's not so much i don't make plays, i defintiely do! I have no problem in the lane phase. Most people use all their spells on minions for some reason and i strike when they have no mana left. I'm all about going in only when it's safe. zhonya's and saved me from many churn the waters lol.
Let me ask you guys this, in team fights that have started, would E>W>Q>R (self)>Zhonyas>E>W>Q>E(blink effect) be the go to combo? or is the order wrong. I find that if i initiate from behind a wall, i am successful and have gotten up to a quadra with it since all her attacks hits everyone and doesn't scale down. If i do it while visible, I'm more 50/50 where they will slaughter me as soon as i W. I'm thinking i should E>R(self)Zhonyas maybe?