Bark will soak up as much water as soil. If you are seriously concerned about drainage, then place each bulb on a small bed of gravel (it is the rootplate at the base of the bulb which is subject to rotting tendencies) and cover as normal with topsoil.

I've debated as well as mulching ontop....while adding organic matter is nice, it will just keep the soil even wetter.

Just short of removing and replacing....wanted to come up with some ideas just to make the conditions better.

I generally mulch in the 2 inch realm. Maybe just a really thin layer than I topdress betwen the seasons, enough, just that some organic matter decomposes slowly.

The water does not puddle but after a light rainy days soaking, in my observing of the soil, it takes a good 2-3 days even before the top shows a inkling of drying out.

Best idea: create a slope, artificial hillside if you will.