Ah, I think you might have these - http://www.sony.co.uk/electronics/headband-headphones/mdr-zx100
By the looks of the headband, that's the one... but I used to own a set of these (before gutting it, and putting in new drivers and giving it to my brother) and I don't remember the baffle being that detailed.
Could just be a memory lapse.
Here's my old work just for reference.
(don't use it as a guide, it's a very old mod that actually didn't sound that great, and it's a totally different driver anyway, so it will get different results)
The headband and the inside of the cup seem identical, but your baffles are clearly more vented than mine... a design update perhaps?
Anyway, back to your mods.
To me that looks like it might be too much cotton wool, you could probably put in less than half that and you should get more bass without it being too muddy.
OR, if you're feeling a bit adventurous you could pop ALL the holes in the back of the driver and simply stuff in more cotton wool if there's too much bass until you're happy.... but there's no going back from that kind of destructive mod without a good stock of micropore tape (thin breathable white medical tape).
You probably don't have any, but cotton make-up removal pads are much easier to work with than clumps of wool since you can control how much you put in much easier.
Also with these cups you probably want to slightly mass load the inside of the cups. This worked well for the AKG K518, so it's certainly worth a try.
Also since your baffles are very well vented, you might want to try covering up vents (simply with masking tape since it's most easily removed without tearing the venting fabric).
This should help tame the bass in different ways to damping... however covering up ALL the vents is not advisable as the vacuum is dangerous to the diaphragm which will bend/creak when you push the cups against your ears.
EDIT - Oh, and it should have the model number on the INSIDE of the headband somewhere
