I'm also working the geometry out right now with my new med ID. I don't know about the 150mm swinger. I think you mean that the rear tire has that much travel. Unless it's custum I bet it's a 7.875" long 2" stroke shock which gives you ~130mm of rear wheel travel. Just a small point.
Anyways, I currently have my front end about 5mm lower (105 marz marathon SL) than the 125mm Talus fork with the same rear end position and I find the bike to decend just OK and I feel a bit forward. It climbs better than anything, but I would like more stability on the decent. I have <2" of standover currently and have cracked my nuts because I'm used to just popping 1 foot out and dragging the bike over impassible objects.
I thought about going to the california edition (3/8" shorter rear shock w/2" of travel), I even dialed in extra sag to simulate it. The bike decends much better, but I missed the high BB for technical stuff, so I'm going to put on a longer fork to get me the same geometry only higher. Yes, I'll loose even more standover height but I'm hearing more and more people say that standover is overrated and if I need to get off the bike, I should just really get off the bike, or better yet ride it.

The fork I'm getting can be quickly dropped to get the climbing geometry back, but if you use a rear shock which is adjustible and drop it for the decent you are reducing travel just when you need it the most.
A lot of the downhillers have the top tube right against their crotch and say it's just the price to pay for a good performing long travel bike.
