DB grow overtime with autovacuum (postgres 9.6.9) - Mailing list pgsql-admin

We use postgres 9.6.9

we set the following autovacuum setting , but still the DB grow overtime

autovacuum = on
work_mem= 50MB
wal_buffers= -1
synchronous_commit=off
log_autovacuum_min_duration = 0
autovacuum_vacuum_scale_factor = 0.1
autovacuum_analyze_scale_factor = 0.05
 autovacuum_vacuum_threshold = 25
 autovacuum_max_workers= 6
 autovacuum_naptime = 10s
 autovacuum_vacuum_cost_delay = 10ms
 autovacuum_vacuum_cost_limit = -1
autovacuum_freeze_max_age = 1000000000
autovacuum_multixact_freeze_max_age = 400000000
 autovacuum_work_mem = -1
autovacuum_analyze_threshold = 10

we have

any idea ?

DB size grew from 11G to 25G in 2wks.

I read that we may need to  increase the max_fsm_pages setting. not sure if it is needed if we have autovacuum or how to do it if needed?

Thank you all

Avihai