Why does the hot water run cold at less than 'full throttle'?
Many new kitchen faucets use a single arm and a cartridge to control how much hot vs. cold water is released through the fixture. Sometimes, the cartridge can go bad as it wears out, causing the mixing process to not work correctly. Shower controls use a similar system. You may be able to get your landlord to replace the cartridge (a simple process for most major brands), solving your problem.

You might also try balancing the hot and cold water using the water shutoff valves under your sink. You can open the hot water valve all the way and then turn the cold water valve down some. This might help if you have significantly more cold water flow vs. hot for some reason.