Hey guys n gurls. Need some help with my base. ATM im focusing on defenses but whenever i raid, i keep losing.

Should i instead be upgrading my research centre.

yeah im pretty choosy of who i attack. i pretty much would just like to maintain my 800+ trophy. Only reason im asking for tips is because I've noticed i have been losing quite alot these days whenever i raid. usually i would just throw in at least 10-15 giants to go for the defenses and 20-30 arches.
BTW i have my gold mines all 4 of em' or was it 5 up to level 8 and gold storage to 501k. dnt think I'll be researching for a town castle or my clan castle. should i increase my troops size and research on archers instead?