Can anyone tell me if there would be any concern if I use a DC 5Volt 4AMP  20W Power Supply Adapter with my Dell Venu 8 Pro?

The reason for the question is, I have a small hub that allows me to charge my Dell and read data files on a USB stick at the same time. However, the current Dell charger (5Volts 2AMP) is not strong enough to actually increase the charge on the Dell while it is connected to the hub. The Dell shows that it is charging, but in reality is actually discarging, albiet, at a slower rate than without the charger attached.