You're leaving the timer visible (The countdown) - alerting the human spammers a timer exists. Alot of those use auto-register programs the timer would otherwise catch. You're tipping them off.
Spammers defeated recaptcha long ago. All it does is annoy legitimate humans. I recommend turning it off and use none of the other native vB human verification.
The settings of the new Ozz Mod - how did you set them?
Would need a admin credential login to check your anti-spam settings to verify everything is set up right. You would be surprised how often it is not.
The new mod is set as follows:
Active: Yes
Dots: 2
Commas: 2
Semicolons: 1
Colons: 1
Hyphens: 2
Prevent Hostname settings:
Ban: Yes
Hostnames: comma separated list copied from file downloaded from first post here
WhoIs: Yes
Useragents: none
Send PM: no
Spambot setting:
Enable: Yes
Min time: 30
Max Time: 0
Action: Show 'No Permission' page
REdirect: None
Force Wait: Yes
All notification is turned off
Ban Spiders settings:
Activate: Yes
Ban Spiders: Yes
Redirect to own ip: Yes
Spider List: copied from file in first post; each on own line
Write to log: No
New Thread: No
Email: No
Spam Management settings:
Anti-spam: Akismet
Post threshold: 5
Anti-spam storage: 7