baha
+1y
Generally as long as your link bar is the same length as half of your leaf spring you should be ok.
That is not entirely true, what effects the amount of lift you get is mainly to do with how close the bag is mounted to the pivot point on the frame. 8-10 should be no problem man, If it were me I would mount the bag in the middle of the link bar so you won't need as much PSI to lift it.
Forward or Reverse can work I would do forward though its easier to set up.