You can match the speed of a bottom pour if you use a large enough ladle. The ladle capacity is critical for 4+ cavity moulds. My every day ladle is one of the later production RCBS ones with a reversible handle. Being left-handed works against me with a Rowell ladle. I too own a #2, but I need to turn it over to my machinist to convert to left-hand operation. He'll probably want to simply make me a complete new ladle, and that's okay too. For now I still use my RCBS ladle for 4+ cavity moulds, I just fill 2 cavities at a time. Temp control is easier with the ladle as well, you can control the mould temp by regulating the lead flow and "spill over" from the sprue plate.
I've had a number of multi cavity moulds that seem to have unique personalities for each cavity. My 4 cavity 452460 should have been named "Sybil", each cavity behaves slightly different, and I have to cast with it in reverse cavity order. If I cast front to rear, the last cavity invariably delivers rounded bases. If I go back to front and vary the flow a bit as I go, all four fill out perfectly. I've broken the parting line edges, but it still seems to want to vent forward. Oh yeah either way, cavity two wants a touch of pressure at the start of the fill, and likes a slightly longer pour. As you might guess, this mould is almost unusable with bottom pour, but it's an excellent example of the control you can get from the ladle. And weight consistency is always superb.