I'm putting down Sevin Insect Killer on my lawn with a Speedy-Green spreader and the setting doesn't seem right to me. The bag shows Sta-Green settings (not Speedy-Green) so I'm converting. To apply the desired 4 lbs. per 1,000 sft the bag says the Sta-Green setting should be 9. I believe converting Sta-Green to Speedy-Green requires a factor of 1.33, resulting in a Speedy-Green setting of 12 (9 x 1.33), which seems very high to me. Thoughts, please.