When using a throttling valve, it doesn't matter where you put it. The flow rate reduction is the same. However, you are probably better off putting it after the filter so it doesn't collect debris.

But another option is to put some DE into the filter. That will add restriction and reduce flow and improve filtering. At least this way you get something for the reduce flow rate. To get 35 GPM, you want to add enough to raise your clean filter pressure by at least 4 PSI and that should do it.

Also, flow rates on pump labels are meaningless. Those are usually run out or maximum flow rates and not what you typically get on pool plumbing.