Hehe, this sounds like a bit of a math problem.  One question, if 222.com is an addon domain why does it redirect to 111.com? 

As far as SEO goes I could probably search and find 10 rules that say it is good to do that and 10 they say it is bad.  Ok, well if they are all still going to the same web site, just with different domains - why not setup 333.com and 444.com up as you did 222.com?

Yep, you could park them, but since 222.com is redirecting to 111.com all of them would be going to 111.com.  Once the parking was done and they went to 222.com, then your redirect there tells 222.com to go to 111.com.  Hope that makes sense.

I would say you would be better off  with 333.com and 444.com doing them like you have done with 222.com to get them to 111.com.  The way cPanel handles things by default is parking domains to the primary address only on the account.  So unless you did some wacky .htaccess redirecting, then you would be better off with the previously mentioned better off way of doing it.

Also you should consider the big picture and long term of things.  Search engines will remove you if they think you are trying to scam them, especially with duplicate content.  Not saying that is what you are exactly doing here, but should be something to be aware of.  As far as SEO goes you would be better off sticking with the basic tips.  Have good content for your specific niche and quality is better than quantity.