Hey Bill
My 2 cents after 3 years of running a Herbie;
I run my gate valve on my return pump, with a 'T' feeding it back into the sump.
This allows me to bleed off the excess pump flow to the sump.
Yes, I don't control the flow from the overflow, but rather I control the flow going to the returns.
I've been running my system this way for 3-coming up on 4 years now and it works great for me.
I did this in the first place because my return pump was overwhelming my drainage. My tank is too close in height to my sump.
Ever since I started controlling my return flow life is good.
So, to recap, instead of controlling your drain, control your return
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