I don’t have an a4, but I think it’s perfect for what you are aiming for. One thing I’ve found really useful in general in this direction is slow (less than 1Hz) sinusoidal meandering of pitch. Just a little, less than a quarter tone in total. Simple, but surprisingly effective addition to pads, like a warped record or bad tape. Even makes MnM pads sound warmer. Oh, and layering a little barely audible amount of noise.
Hope this helps