Devoted Follower of the Most Holy Church of the Evil Bob. Possessed and down the road to become chaotic, evil & naughty. All hail the Evil Bob and his Stargate.
IMHO, you made two errors here: Penny sleeves Mayday sleeves
This post might not be very helpful, but all I can say is I refrained from using penny sleeves (regardless of manufacturer) and only buy quality sleeves (in my case FFG, but there are also other brands around who offer good quality).
Search for "Mayday" and "sleeves" in these forums.