Gym defenders

These are my gym defenders. Gym scene in my area is balanced but competitive. Now, I take down gyms less for coins, but more for gold gym badges and to use up healing items.
1: Blissey CP 3215 L40 98% 15/15/14
2: Blissey CP 3205 L40 96% 15/13/15
3: Chansey CP 1223 L33 62% 14/9/8
4: Chansey CP 628 L15 96% 15/15/13
All have ZH/DG.

5: Snorlax CP 2875 L33.5 60% 7/13/7 ZH/BS
6: Gardevoir CP 2677 L35 75% 11/11/15 C/DG
7: Dragonite CP 3560 L40 96% 14/14/15 DT/O

Questions:
1: What should I do with Chansey #4?
2: Should I max my best BS Snorlax at the end of this month?