Import to one syste faster than to other one

Hello

We have one development S11 and two test systems(SH1 and SH2).

Transport requestsare delivered via transport group to both systems SH1 and SH2

I wander how I could make sure requests leaving development system S11 are first imported to SH1 than to SH2.

I had in mind frequency of import job (but even with very frequent import job on SH1 sometimes could be first imported to SH2)

What else could I do?

Thank you in advance