Upgrade Strategy input

I'm stuck. My Silo is at level 14 and is full. Is it correct that level 15 is the max level,for the Silo? I have two TFs left at level 9. I'm not sure of the next best step, as I have few gems and few coins... Should I: 1) finish upgrading the level 9 TFs to level 10, and then start levelling up the TFs to 11? 2) when I finish collecting the required 200,000 coins and max out the silo to level 15, so at least I can go on missions and collect the special items and plod along amassing coins and gems and special items for TF upgrades? Talk amongst yourselves 😁 Thx!
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