Do you get any error messages when you start kamailio or give
lcr.dump_rules command? If not, then most likely all the rules are
loaded.
If you have 73K rules, then
modparam("lcr", "lcr_rule_hash_size", 1024)
is way too small value if you want efficient hash table lookup, but it
does not affect the number of rules.
lcr.dump_rules only printing 4096 rules may be rpc limitation.
-- Juha