Aloha sonnyh,
The htaccess files with the dates appended are just backup files, when BotBanish was installed it created them. As far as the IP that were still in your htaccess file, were there two different set of IP denial areas in your htaccess file? Are you running on Apache 2.2 or Apache 2.4? BotBanish 3.4.00 will use the 2.4 version format if you are running on 2.4 and 2.2 if you are running on 2.2. If the IP addresses you mention are in the 2.2 format then BotBanish running on Apache 2.4 will not manage those entries and they will need to be managed manually. The next revision of BotBanish will offer a conversion of the 2.2 format to 2.4 format to make the htaccess file uniform.
As far as the 403 errors, where are the 403 errors? Are they in the Apache error.log file or are you seeing them in the SMF error log? Could you show the errors because they are permission errors.
BTW: Just removing the IP's from the BotBanish blacklist will not suffice, you would also need to add the IP's to the BotBanish whitelist to keep them from being blocked again on your system. Then those IP's will only be allowed on your system not everyone else's.