No worries. We’ve all got subjects that are real sore spots for us. 
I just wanted to assure you that I didn’t think there was any ill intent in that post.
It’s absolutely right that a C on a 10* produces the same number of ascension material rolls as an A+ on a 7*. Sounds like you got it perfectly!
All titans drop a mix of 1* through 4* ascension materials for everyone, A+ through D. Usually, you get 1* or 2* stuff like Training Manuals–no matter how strong the titan or how well you did. But with stronger titains, you get more rolls, even at a C.
Because of this, you are more likely to get a 3* or 4* item with a C on a strong titan than with a C on a weak one. It’s just like flipping a coin: the more times you flip it, the more likely you are to get at least one heads.
In case you might find it helpful, there’s a picture in this post that shows which grades on which titans produce the same number of loot rolls:
If you go down a column, every entry in that column is at the same loot tier. So if you go down the middle column, you can see the case we were talking about: a C on a 10* is the same as a B on a 9*, or an A on an 8*, or an A+ on a 7*.
Did that cover everything you were wondering about?