Nobody's disagreeing with you, Paul! I think the Rat Impulse internals come in at about 1190, but they also have a ND RIP valve, so I think it's wrong to compare the other internals to an impulse with a stock valve.
Having said that, I've found that every impy I've shot with a brass hammer has had too much kick for my liking, even with super-light bolts. But 1386 (or whatever
PimpDaddyZanwaa worked out) should be fine in my opinion. Heavy enough to work efficiently, but not so heavy you'll get kick or sluggish cycling.