In my humble opinion... from looking at your whole team rather then just the guys you showed...
Start Robinson at PF, and play him alot - the Ramos PF is horrible.. Your rebounding is weak and you get a penalty for playing a SG at PF. You can play SG at PG or SF without a penalty I do believe... You can play SF at PF or SG too... just don't go more than 2 spots away generally
As you can see in your first game, rebounding killed you.
Height means nothing. Just window dressing from what others have shared and as far as I have noticed.
Turn down the 3 ball too. Doesn't appear to be a good option based on your first game!
As far as your actual question, Austin should probably start at SG when you play a pressing team IMO.
Ollie and Meister might both best be served off the bench. The Per rating can be tricky from what I have learned - not always that predictable and effective shooting has a lot to do with BH, SPD, ALTH too...
U should probably play slow down as much as possible and recruit a rebounder next season (or several). You have some nice players but I some glaring weaknesses with the bigs.