Does the actual Kemper Cab maker not work right?

Hey I noticed that all my IR cabs converted with the actual Carmaker sounding quiet and different. I have Ownhammer IR's if I convert them 44.1 24Bit Wave by myself with the cabmaker it sounds very bad against Ownhammers Kemper files (which were created in Feb 2015,i had a look) These ones are much louder and amazing! Is there a known Problem, with the actual cab maker`? Just asking...

Alright I have to correct myself, there is at any rate a volume jump on the older Kemper Ir's vs the new converted ones of me, when I have set them to the same level, the new ones are actually better, more dynamic feel and 3d but very dark sounding against the (older)Ownhammer kemper files.