And you are saying you had NO overlap before adding this fork? Doesn't make sense. Every fixed gear bike I have ridden has some overlap. You just have a little bit more now probably because of less rake. You have to get used to it. The point of that fork is to barspin. You have to know where your pedals have to be to spin. Getting a higher offset / rake fork will just give more overlap when spinning.

700c FGFS geo just has a super long top tube. Like the thrasher v2 has a 53cm seat tube, but a long top tube of 61cm. That is for less overlap when barspinning.

26 FGFS geo has even shorter seat tubes for lower standover, and the same long top tube. With 26 inch wheels, and certain frames you wont get any overlap even when barspinning.

EDIT: There are other differences as well, like bottom bracket height on FGFS bikes. But Low standover, and long top tube are the main ones.