Ohai Trachy. You rated my PU team very thoroughly, so I though I'd return the favour. I used this team for a bit on PO, and won 15 of my 20 or so battles. It's pretty solid, and I suppose the reason you were undefeated was because you're better than me, so really it shouldn't need any improvements. However, I'm going to go ahead and talk about some things I had trouble with.
Firstly, Absol. Wow, this set works wonders. I know it could potentially have problems with Haunter and the like, but it seems they really don't like you getting to +6 behind a sub. Nothing to change here.
Next, there's Golem. I know you may have had different experiences, but I never found the Custap Berry + Explosion combo useful. Sturdy wasn't a huge help due to having no spinner and not being a lead. I would suggest a Lum Berry for this guy as being burned really sucks. You could, alternatively, use your old Fling set. Maybe give him Sucker Punch. Whatever works.
What I noticed with Ampharos is that your team doesn't really have any fast, frail sweepers that can take advantage of the screens, so they're not being used to their maximum potential. Heal Bell is a great option on Ampharos, as are Volt Switch and Focus Blast. Leftovers would obviously be a better item if you're not a screener.
Gurdurr looks really good. As I mentioned in my comment, Mach Punch is a really useful move for him. Replace Stone Edge - you get perfect coverage anyway, and Golem takes care of Flying types easily.
Ludicolo is a great pokemon, but I'm unsure what you're trying to do with it. Modest nature and three attacks isn't very wise with only 44 EVs in Special Attack. In my opinion, Ludicolo makes a great SubSeeder in NU - give him a Timid nature, max speed, and split EVs between defenses (more % recovery means more substitutes). Get rid of either Scald or Giga Drain, as you need Ice Beam for grass types. Giga Drain is nice for extra healing, but Scald has that nifty burn chance, so either one works.
Of course, if you want to make him an all-out attacker, just keep him as he is, except invest more EVs in special attack of course.
Lastly we move onto Misdreavus. I like this set. No suggestions.
I'm going to finish this rate off with a quote that seems very relevant: "Again, this is a good team and it might be hard to replace any of the members or moves because it is made so well." - you. Good job anyway.