I go by water temp, if it is 50 degrees or above I run both cranks on one side and harnesses on the other till the fish let me know which is a better selection for the day. But typically April is still going to be cranks due to water temp. And I start out at .8 MPH to a max of 1.4 MPH in the colder water. Slow "S" turns will help you dial in the correct speed. Around the Islands, 35, 55, 65 back with 1 oz inlines a 3 oz bottom bouncer off one corner ( no board) should cover the water column for you at that time of year as a starting point if your going to run inlines. 5 more foot of line out with a 1 oz inline is usually only a couple of feet deeper so while looking for biters keep it simple till you find at least a couple of biters, then you can adjust to dial the exact number in. When the sun get high the walleye typically rise up in the water column since the sun is warming that part of the column. So if you were getting bites at 55 back and the sun comes up high in the sky and bright, start shortening your line out numbers. I've taken plenty of walleye with only 8-10 ft of line out behind the board using 1 oz inlines in the spring. Even in 45 FOW. Typically the largest walleye of the day is on the high line. I run my deepest baits closer to the boat, shallowest the farthest away from the boat.