What you have there my friend is a toe hang blade style putter. These are designed specifically for the toe to turn over through the stroke, and work best with an arc path.
Trying to get them to go sbst, is like asking a kid not to like icecream …. it just doesn't work …. without some operator manipulation during the stroke, and that's not good for consistency.
If you hold the putter up horizontally, and find its balance point on a finger, while its balanced on your finger … see where the toe of the clubface points. The more it points down towards the ground , the more toe hang is has (and the more arc you should putt with).
A mallet style putter on the other hand is more likely to be face balanced (when you do that test again, its face points to the sky). These are more suited to a sbst stroke, so ideally, you want to match the putter to the style of stroke you wish to put on the ball.
Just my 2 cents worth …..
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