Dropped McCovey in order to do that and I am platooning at the DH spot with Cromartie/Tovar.
This sounds like a big mistake. You should never drop McCovey unless you are sure that you have one of his two bad years. If you have one of McCovey's 3 good years, he is gigantically better than Cromartie/Tovar. If McCovey has been picked up as a free agent, then he is probably on a good year.
In general, you need to figure out the specific year for each of your players. If Carbo is playing his best year, it is crazy to cut him. If it's a bad year, then cut him.
Although I loved his athlete's body, I don't like Lolich's card. So, I'd cut him. Regarding Marichal, what are his left/right splits like? If he is better against lefties, don't cut him until you are positive that he is on a bad year.