Blacks consumption on Canon PRO-300

[francescogola]

Hello!
I'm really enjoying my new Canon PRO-300 printer, but I feel there is something strange with blacks.
As you know this printer runs with two cartridges of black: MBK and PBK.
Considering that so far I printed ONLY on cotton papers, I feel strange that PBK level is lower than MBK level, so that matte black is less used than photo black.
Is this an expected behavior as in any case on cotton paper MBK is just put "on top" to the PBK, or is there something wrong in your opinion?
Consider that:

- Prints are coming out perfectly in terms of expected blacks, so I "feel" MBK is used.
- I'm using .am1x paper profiles so I'm sure that MBK should be "activated" for the specific cotton paper (Hahnemuhle Photo Rag Ultra Smooth btw)

Thank you for any advice!

[dgberg]

I may be misreading something in the translation. Your cotton paper should be printed with matte black ink, at least that is how all my Epson's and HP print.
If that is what the Canon does then your matte ink should be lower because that is what is being used.

[francescogola]

I may be misreading something in the translation. Your cotton paper should be printed with matte black ink, at least that is how all my Epson's and HP print.
If that is what the Canon does then your matte ink should be lower because that is what is being used.

Oh sorry, I inverted the inks in my message 
You're right that is what is supposed to be.
In my case, PBK level is lower than MBK level after printing only cotton paper.
(original message now edited, thanks)

[IPDOUGLAS]

Should be an easy enough question for Canon to answer though I suspect they will not.

Perhaps both inks are used to 're-inforce' the black density?