I have no problem with you whaling...you're keeping our FTP game alive. Has it resulted in you breaking into the top PoC ranks?

Q1: I would drop the heavies...all of them. But that's just me. I feel they're too high cost, too slow, too low DPS, and the HP is just delaying the inevitable while you struggle to get enough gears to drop a replacement. Though if you drop them all at the same time you may suffer from decreased platoon performance. Someone better with Heavies than I am would need to prioritize them for you.

Q2: Put Catriona in there right away. In my platoon her performance level is equal to other 5* M tanks 4-6 levels higher than her own. With her huge range she can follow behind your deathball and you won't have to worry so much about her relative fragility. You already have one of the Arty-Chans, but as we discussed earlier in the thread it may not hurt to have two 'I win' buttons. Don't have any experience with Polina yet, but she sounds intriguing. Other than Edna, who hardly ever dies, I'm not too fond of Haste tanks unless you don't mind sacrificing and repairing them. My goal in most cases (end event tiles excluded) is to make it through a map without losing a single tank, and I never actually plan on throwing one away.