A 3 oz or 4 oz weight seems like a lot of weight but it takes that much to hold your line down with all of the drag when moving 1.7 or 1.8 mph. I came up with a formula for determining the depth of your bait while pushing. Look at the "right triangle".

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If you reset your line counter with your weight at the water surface, let out 15 ft of line. Your weight will now be at a depth which is 2/3 of the amount of line you let out. Or, as in the pic, 10 ft deep. For this formula to work, your line needs to go down at close to a 45 degree angle. If you're wanting to run your bait deeper than 10 ft, a 4 oz weight may be needed. Another way to decrease the drag when pushing is to use a crankbait that doesn't pull so hard. That's another reason I like to use the small Arkie Crappie Crankbait when pushing.