Actually there is nothing wrong with the putter you have . The 70 Versa putter is a good putter . It will spoil you once you learn it . At the same time for 700 credits less you can get the 96 Versa and be just as happy . Sometimes its not the club but the player using the club .
Work more on reading the greens and learning your putter . Dont upgrade until you first improve your overall putting . If you cant play well with what you have , then you wont play well with what you get . It all starts with you the player . Just practice more and your game will get better . Focus on your weak points which is your putting and wait on the upgrade .
Hope this helps and good luck with your game . :-)