Tuning MySQL/PHP/NGINX/PHP-FPM

Need some assistance tuning some configs. Any help is appreciated. I have two VPS's, a 768 and a 512 both running arch linux. The 768 runs nginx/php-fpm/php/postfix. The 512 just runs mysql.

Here is my.cnf from mysql running percona server 5.5.25

[mysql]

# CLIENT #
port                           = 3306
socket                         = /var/run/mysqld/mysqld.sock

[mysqld]

# GENERAL #
user                           = mysql
default_storage_engine         = InnoDB
socket                         = /var/run/mysqld/mysqld.sock
port                           = 3306
#bind-address                   = 192.168.130.231
pid_file                       = /var/run/mysqld/mysqld.pid
thread_concurrency             = 4

# MyISAM #
key_buffer_size                = 64M
myisam_recover                 = FORCE,BACKUP

# SAFETY #
max_allowed_packet             = 8M
max_connect_errors             = 1000000
skip_name_resolve
#sql_mode                       = STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE,ONLY_FULL_GROUP_BY
#sql_mode                       = STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ENGINE_SUBSTITUTION,NO_ZERO_DATE,NO_ZERO_IN_DATE
sysdate_is_now                 = 1
innodb                         = FORCE
innodb_strict_mode             = 1

# DATA STORAGE #
datadir                        = /var/lib/mysql

# BINARY LOGGING #
log_bin                        = /var/lib/mysql/mysql-bin
expire_logs_days               = 14
sync_binlog                    = 1

# CACHES AND LIMITS #
tmp_table_size                 = 16M
max_heap_table_size            = 16M
query_cache_type               = 0
query_cache_size               = 32M
query_cache_limit              = 1M
max_connections                = 200
thread_cache_size              = 50
open_files_limit               = 65535
table_definition_cache         = 4096
table_open_cache               = 4096

# INNODB #
innodb_flush_method            = O_DIRECT
innodb_log_files_in_group      = 2
innodb_log_file_size           = 64M
innodb_log_buffer_size         = 8M
innodb_flush_log_at_trx_commit = 1
innodb_file_per_table          = 1
innodb_buffer_pool_size        = 256M
innodb_additional_mem_pool_size = 20M

# LOGGING #
log_error                      = /var/log/mysql/mysql-error.log
#log_queries_not_using_indexes = 1
slow_query_log                 = 1
long_query_time                = 2
slow_query_log_file            = /var/log/mysql/mysql-slow.log

[safe_mysqld]
err-log                        = /var/log/mysql/mysqld.log