Drift Bible is a fantastic teaching tool- and straight from the guy who was credited with being the founder of drifting. It teaches about weight balance and weight transfer too (red foam balls and the brake/throttle pedal pressures), which are arguably fundamentals for drifting. Welded or 2way diff+coilovers= driftable car...its in the video along with controlling/ drifting underpowered cars (the KA has more power than the AE86 used in the vid, I'm almost positive).
I think you will feel a world of difference with controlling your drifts with a welded. Keep watching that video and pay attention to the weight balance and the angle of approach before the clutch is kicked and I'm sure you'll get the hang of it.
For spinning out.... just practice practice practice. After all of that practice you'll get a feel for when you're at the car's max angle. From here you'll know any further and you're either going to make a quick adjustment or you're doing a 180. The adjustments can be one or more of the techniques discussed in the video or just a simple throttle or brake correction.
Just keep at it and watch lots of drifting videos!
