I'm not glossing over their struggles at all.
I am just illustrating in really a rather irrefutable way (IMO) that your premise for how to fix them is flawed. Like, woefully flawed. Let's recap:
- Teoscar, Bo, and Vlad are already doing what you want them to do to a fault and they would probably be significantly better hitters if they instead tried to pull the ball more often.
- Jansen and Springer are already doing what you DON'T WANT THE TEAM TO DO and they are having great results
- Even Espinal is having great results by making a process change that is the precise opposite of what you are preaching; he is intentionally trying to hit the ball harder to the pull side and it's working
- Kirk is already an all fields hitter
- Matt Chapman is probably physically incapable of transforming into the player you want him to be because of his uppercut swing. I think the shortest path to success for him is just to get in front a bit more so he has less FBs to CF and more to LF.
A lot of the RISP numbers are just noise, luck, and nerves from younger players. Like, they have a .204 BABIP with RISP, a big chunk of that is just bad luck.
They need to be better with RISP but most of what needs changing is just between the ears. Trying to ham-fist approach changes onto previously successful hitters is how you break a team. They need to relax. If by "stop trying to hit home runs" for you means "calm down" then sure they need to calm down but this is a team of sluggers and they should absolutely be trying to send baseballs into orbit please and thanks.