Extend your ease of playing at the The end of the bow that houses the screw mechanism, where the hand holds the bow. (Also 'Heel' or 'Nut') of the bow by practicing Kreutzer 13 with the original slurs using mainly your hand and fingers.
The combination of slurs and separate notes also helps us focus on differences in bow speed.
Make sure that the first finger does not grip the bow as gripping will inhibit bow action, especially on up bows. You can also challenge yourself to practice this exercise without the first finger on the bow.