157-ya artillery suggestions

Hello everyone, I really enjoy playing the soviet 157-ya division and I was wondering if you have some advice about choosing artillery.

I usually take:

1) 82mm mortars (6x, rookie) since they have more range than the 120mm mortars and I use them to smoke before pushes;

2) one BM-24M to have rocket artillery;

3) a B-4M 203mm (1x, trained) for hard punches (I prefer it to the 280mm because of the range)

4) 1x trained Bereg or 2x trained BS-3 100mm for counter-battery.

I’m not sure to stick with the BS-3 since they do not hit very hard (1.75 HE), but I like them because they have a good range (20k) and fast aiming (14s if I remember well). Should I swap them for D-30 or the Bereg for counter-artillery?

Do you have any recommendations to improve my choices?

Thank you:)