Upgrading to Th8

Hey guys I have a question to ask.

1) I use to farm 1 - 2 mil per hour in silver league (1100 -1300) but now i dont find any loot does any one know whats the perfect trophy level for farming at th 7
2) Im maxed th7. By that I mean my defenses, Barracks, and camps all maxed for th7. But my walls are lvl 7 and theres only 30more to go till im compeletly maxed. My question is should i upgrade to th8 and try and do 30 walls to level 7 or should I stay and max them out before i upgrade. Everything ekse is upgraded and all i do now is just upgrade walls.
3) im also clanless and need a really good clan. Im level 64 btw. I need a clan with 200+ Donations per person. I like to donate and I like to recieve.
Thanks