I am having the similar issues. I changed my slave cylinder a few months ago, it was better for a while but now it is back. I have 138k miles on the car and I believe it is the original clutch, I have the car just over 4yrs now, got it with 97k miles. Anyways, I know for a fact now that my clutch is DONE. I have am getting clutch slippage in basically all the gears to the point now where it starts to disable my cruise control when I am cruising at highways speeds because the clutch slippage it interpreted as a clutch disengagement (at least that what I noticed). I also have the 'hard to get into gears' issue, expecially on colder mornings, I am fighting regularly with gears 1 and 5 to the point where sometimes I just skip them to avoid the 'argument'...lol
Anyways, I have parked it as of yesterday, I know the next step is that I will leave home one day and need to wrecker to get back so I rather avoid that expense. I will soon attempt the clutch change myself and post my learning experience to YouTube, current there are not videos of a TSX clutch, plan to be the first. Wish me luck.
My advice to you is to change all the clutch related parts - clutch disc, pilot bearing, Throw out bearing, Flywheel(or resurface) and while you are at it, change the axle seals and definitely the crankshaft main seal (preventative so you dont have to go back in later on).