I don't wanna be this guy (srsly), but it sounds like you're doing it wrong. I mean this as seriously as it gets, if you're not progressing your abilities and items then of course you're going to lose. You don't need fed on kills, there's farm, there's always farm. That's like saying zed doesn't get scaling so hes a bad adc, but he's not.
For example, you can jungle soraka (yes its possible I've done it and won before), but you're not going to gank for kills. You're ganking for the supp, double supp and jungle control. She doesn't have any jungling abilities; yet, she can kill golems at lvl 2 with a dorans and 2-3 pots. Maybe shes not the best for that killing gank, and maybe shes not built for jungle. (but) When your tops about to get a kick in the head by Jayce, silence him and heal your ally, this puts Jayce at a hard place with your ally having armor and newly rejuvenated health, and unable to cast spells being hit with about 109stardrop + around 100basic atk combined with your tops help.
So all you need for trist is navigation and coordination.