Nappy rash help please

[wellbalanced]

My DS 15wk old is in reuseables- AIO Totsbots, Bumgenius, weeenotions, Blueberry's and Itti bitt's and at the moment (prob teeth) has awful explosions of which i change straight away but still he has a very sore bottom, I was told not to use cream with reuseables is that right? Even with paper liner?
We have plenty of nappy free time and at night (disposable) i plaster his bottom with cream and its alot better by am...

Cream is fine to use with cloth - Blake used to need barrier cream at every nappy change. I just used to make sure I used a fleece liner (to protect the nappy, as cream can damage the absorbency).