Originally posted by @jmwinrider
ok so what i can determine from this brief experience is that these forums are essentially useless. This whole process of shouting into the void seems quite pointless.
The answer to your original question seems to be no, we cannot explain the rating band gap.
However I don't agree that the forums are useless.
First of all the mods look at the forums and your question may be passed on to someone who can give you an answer eventually.
Secondly others can suggest alternatives as I have done to get round your problem