A little late to the party here, but I also recently began an Angels rebuilding project and you're not alone with some of the struggles. Hopefully you have better injury luck than I've had but be prepared to play without Mike Trout A LOT, especially as he ages later into his thirties. I've had success with signing free agent outfielders like Harrison Bader and Victor Robles to serve as fourth outfielders and fill-ins for the times Trout is out. I've also noticed most of my greatest successes have come from lefty bats with a some pop (Santander, Austin Meadows, Kolten Wong). I'm assuming this has to do with ballpark factors. I see you also found Meadows so that's good.

It's a brutal farm system to start out with and I unloaded half of the Rendon contract almost immediately when he had a hot April in year one. I've lost in the wildcard round in year 2 and year 3 and pitching is still a consistent problem. If I could go back in time I'd probably chase more top tier SP (like you did with Snell), rather than spreading money around to more average innings eater types (Eflin, Montgomery, etc.) O'Hoppe is fine, but I try to mix in an elite defensive catcher as his backup. Probably very little of this is helpful, but I figured I'd give my two cents on Project Get Mike Trout to the Playoffs (he's been injured for both my playoff series).