Remember, Frontline is the best event to farm silver, but for that you need some good premium tanks & crew (ELC, SKODA T56, PROGETTO 46, BORASQUE, TS-5 etc) and DON'T use any gold, ratios or large kits. My best reserve picks are MINES, ENGINEERING, SCOUT, RECOVERY and i always start the same, trying to either get cap points or decap for fast rank promotion and after that switching to whatever the situation requires.