If it feels like wood, my first thought would be the pad to rotor contact is poor due to glazing or one or both caliper pistons are not operating properly.
If you haven't done so yet you might bleed the system with new fluid. If there is old fluid the properties of the fluid could cause the problem.
Good chance the calipesr are overdue for a rebuild.
Your brakes should be the priority on your bike. Good luck!
Just to add to this, you can easily de-glaze the pads. Pull the pads, and scruff them up on a
nice, FLAT, concrete sidewalk. Some brake cleaner to remove any oil/grit wouldn't hurt either.
On your model, your front calipers float / self center themselves on pins. These pins, over time/use, tend to goo up and
stick. If your pads are worn pretty evenly, the sticking shouldn't be bad in your case...
When they stick really bad, you'll see considerably more wear on one pad than the other. Remove the pins (you can do one at a time), clean and re-grease with BRAKE SPECIFIC GREASE ONLY... Unless they've been done recently, you'll find they'll now move considerably easier and center themselves, thus grabbing better(now using both pads vs just one(if the caliper is NOT MOVING and centering itself).
Unless your brakes are dragging real bad on their own, the seals are likely ok but a brake flush (and getting rid of any air in the system) will help as noted above...
Wipe off your rotors as well
with brake cleaner should they have any oily crap on them. Keep cleaning until your paper towel comes off nice and clean.
If you have an air compressor, blow around the pads, calipers. You'll be surprised how much normal brake pad/dust accumulates in there and eventually gunks up. I'll blow out my calipers at least once a month (no disassembly) and you'll see a dark cloud of brake dust come out...
Good luck and please post what you find...