I have a '08 M60 Tank and it has been very disappointing. Here is how to fix the discharge. First, right at the discharge is a bar at the bottom that runs from back to front of the deck. I assume it is there for strength but it just gets in the way. I unbolted it and the chute and no more clumps! The clippings would just collect into the corner and eventually just fall off leaving big clumps in my yard. Another thing to check is the grass deflector in about the same place. It is just a bent piece of thick sheet metal and it starts to bend. When it bends it exposes the flat side of the deck and grass can start collecting too. With that and the bar in the way your destined for clumps. I unbolted the deflector, bent it back straight, then welded round rod onto it to stiffen it. Hasn't bent since. Your only modifying a small bracket that unbolts so don't freak out. Mine has also broke 15 belts at $54 each in less than a year. Haven't been able to fix it (although a deck adjustment could fix it) and I don't care to because I'm trading it off for a Hustler Super Z.
Clutch bolt snapped dropping it and cutting the wires all the way off.
First 2 mins of mowing after buying it new a deck wheel fell off and I cut a massive chunk out of it.
Deck wash doesn't work all that well.
No oil drain hole for the oil filter which makes a mess when changing it.
Touchy steering, can be herky jerky until u get used to it.
Seat safety switch failed after 150hrs, not allowing me to engage the blades.
The machine has the makings of being a great mower but the deck overall let's the whole package down. The new tanks have an all new deck which might be great but I have a bad taste in my mouth for the cub cadets now.