Sorry to bring this back from the dead.
I plan on doing Tomei sump mod, and probably the line from rear of head to sump.
I talked to my machnist and he says the restrictor seems like a reasonable idea to limit flow for oil surge issue. The problem he says for my application is he's worried about the hydraulic lifters with the oil gallery restrictor. He described a VERY similar problem that can happen to the individual on this forum who ended up having lifter noise.
My application is for street driving and occasional/frequent drag racing and less occasional road racing.