You'll have to get something much newer, or a Deere to be able to easily use two backhoe functions at a time, that's just the way they operate with open center hydraulics. you can hold the first one partially open and feather to get them both to operate, and still need to do that a little on a Deere.
The stalling in first gear is bad, it should slow the engine down and blow black smoke, or spin the tires. Just sitting there is slipping the reverser clutch most likely, not good.
The stalling in first gear is bad, it should slow the engine down and blow black smoke, or spin the tires. Just sitting there is slipping the reverser clutch most likely, not good.