Just cut back to 1 tsp a day. Make sure you drink enough water a day, half your bodyweight in ounces of water. Change your tablesalt to Celtic Seasalt (or Himalayan salt) it has over 70 minerals that your body can use. If you don't use salt enough you can always put some in your drinking water.
Since you have a BM now every day you can do a liverflush. And after the 2 days you can go on with 1tsp ES till you finish the 3 weeks.
You like to get your liver clean so the bile gets flowing better to help your digestion and your constipation. Just the Epsom Salts is not going to solve constipation problems without improving the liver function, drink enough water, eat a lot of fruit and veggies.