It is said that various limits have been reduce but not eliminated. Please is there a chance that I can be blacklisted again and made to face another evil?
No, you can only be banned if you break forum rules. Forget about the evil IP problem, it was never your fault to begin with, it was because of the IP with which you registered with, some users who share the same IP or are neighbors to it have been banned in the past, so that is why your IP was marked as evil and you have to pay a small fee to post, or get whitelisted.
My last question is what other limits will I face again in this bitcoin forum?
Just limits on posting and in sending PM's, but they clear out as your activities increase. Read this thread:
https://bitcointalk.org/index.php?topic=178608.0