high humidity and temps are the foundation to bud rot (botritis).
get a humidistat and dehumidifier in addition to a thermostat and fans/air conditioning.
try to keep humidity under 50% at all times during flowering. this is key.

Also, flowering for 52 days is less than 7 1/2 weeks. unless its some amazing strain that finishes super early, try letting it go 8-9 weeks after you fix your temp/humidity issues.