Insert/pack & insert/rate/region

Dear mates,

I am trying different ways for inserting particles in LIGGGTHS 3.3.0 and found quite different results. I have gone through this forum and seen a complexity in different insertions posted by previous members. What I am using here are insert/pack and insert/rate/region, and following points I have observed:
- insert/pack: provide a high accuracy to my expectation of the size distribution. The particle size distribution (PSD) is satisfied well, for example with 6 diameters: 0.1; 0.2; 0.4; 0.6; 0.8; and 1.0 mm. However this method cannot reach dense condition in a pre-defined region, i.e., void fraction 0.4-0.5. This method uses static insertion where particles are placed initially without moving, making the insertion much faster. But the position of particles is made randomly with different seeds.
- insert/rate/region: particles are inserted initially at a pre-defined region than start moving while the insertion is continued. This is a dynamic insertion and as a results, very time consuming. However the position of particles is more acceptable. Another problem of this method is that its accuracy of PSD is very low. It is very disappointed when this method results in a much difference in size distribution compared to the expectation.

Is there any one experience the same issues about? Please share your opinions here, especially how to match the expected size distribution well and to optimise time insertion.

Thanks you,

Regards,