CB Wrong Engine Detected

I tried searching for similar threads, but couldn't really find anything that directly related to my question:
I'm trying to make sure CB only REALLY solves captchas that are over 70% success rate. However, I'm noticing that very often on many different engines that it is blatantly recognizing the wrong engine, and therefore still answering the captcha. Example:
http://postimg.org/image/ometvmj2n/ -> my image = Article Beach
Engine Detected: Pligg (blue) -> which has a 100% success rate, but is not our image above
Another:
http://login.a1articles.com/tmp/e2ee84.jpg
Engine Detected: Guest book (big captcha) --> is not our image above (I'm not sure what engine the image above is, but it's definitely not this one)
Is there any suggestions or settings to reduce the amount of mismatched engines that CB finds? Even if I were to set the solve rate to 100%, in our scenario 1 above it would still solve the captcha wrong every single time
I'm trying to make sure CB only REALLY solves captchas that are over 70% success rate. However, I'm noticing that very often on many different engines that it is blatantly recognizing the wrong engine, and therefore still answering the captcha. Example:
http://postimg.org/image/ometvmj2n/ -> my image = Article Beach
Engine Detected: Pligg (blue) -> which has a 100% success rate, but is not our image above
Another:
http://login.a1articles.com/tmp/e2ee84.jpg
Engine Detected: Guest book (big captcha) --> is not our image above (I'm not sure what engine the image above is, but it's definitely not this one)
Is there any suggestions or settings to reduce the amount of mismatched engines that CB finds? Even if I were to set the solve rate to 100%, in our scenario 1 above it would still solve the captcha wrong every single time

Comments
http://postimg.org/image/sx6hy4xkl/
Here is scenario 2:
http://postimg.org/image/ohnzhutub/
(just look at last image in log). My house is hovered over Guestbook (big captcha) on the engines above and you can see what those captchas should look like.
But you know, this should defenitely be your next update on Captcha Breaker.
I am using it CB to do just ONE thing on ONE site with my own script, so i will only use one type of captcha engine (my own one that I created).
Yet it detects 4 others due to as you explained : Similar color, image size etc..
BUT.. You know what really is bothering me
Is that I have all the other engines unchecked to point CB in the right direction, and it STILL detects the other engines and even logs "skipped by settings" because I disabled that engine to be used for these type of captcha's.
so the next LIVE SAVING update of CB for me would be, please use the other available / checked engines. You already display like 5 engines, yet take the first only and if its unchecked its skipped by settings. Maybe add that if unchecked go to the checked engine for this detectede captcha!!
@sven you would save a lot of trouble for me if you could update this
However as written in the other threat, you might want to enable the option to treat unchecked captchas as not present.