After 2 years of pen spinning I went to a gathering to meet the other people in the pen spinning community. Some of them could solve the cube and the dude who was the fastest of them solved it in 33s. From that day I promised myself that I would break 33s.
For H-Perm on big cubes I use:
R2 U2 R U2 R2 U2 R2 U2 R U2 R2 or z' U D L2 U' D' x' U' D' L2 U D.
I cant give you a good alg for Z-Perm but check out the PLL site on the wiki and find the alg that you are most comfortable with.