I am not arguing from either side of the debate, but if you can remove air resistance as a factor by performing the experiment in a vacuum chamber or using identically shaped enclosures(like a water bottle filled 1/4 and on full) Everything hits the floor at pretty much the same time which means falling at the same rate.
Also, whether by centrifical, acceleration upwards or gravity accelerating downwards, the objects would essentially react identically. Gravity supporters point out some measurable but absolutely microscopic differences determined on ground density and altitude that needs to be explained better than what it has been so far. Like I said, I am not trying to argue from a side but someone will take offense to that more than likely.
You can clearly see that gravity is the effect in play and that the earth is not accelerating upwards. The idea of constant acceleration at a steady rate with no force behind it is asinine.
Ah, you speak of Ylva. The great energy source of the earth's underside. I fear if we ever see the day where Ylva energy is exhausted and life as we know it ceases to exist.
As for current conditions: I have tested this subject thoroughly.
An easy example: I go to the local farmers market on Sundays in the summer and I like to buy large bulbous eggplants. I noticed one day that when I accidentally dropped all of the local product which I was carrying...the foods hit the ground at approximately the same time. I then picked up mandarin oranges and one of the biggest, firmest eggplant bulbs, and held my arms straight out. To my astonishment, the oranges hit the ground at the same time as the eggplant. Now, I had ruined my beautiful purple specimen doing so but it demonstrated to me that the earth's acceleration did not lead to unique outcomes for the fruit.
However, the shape of objects and their composition can be effected differently by our atmosphere. It is not strictly related to mass though!