Step away from the saw............................and nobody gets hurt!

First things first. If your suicide perch is typical, you don't want to notch it because you'll weaken it.............assuming you're talking about notching the gusseting.

Part of what you want to be careful about is having anything on the chassis hang below the scrub line. That would be the height from the ground when a tire goes flat. Based on your 25.5" tire that would be somewhere around 4.5-5". Suspension brackets, tie rods, oil pans, transmission, etc.

You've lost me a little on your description but if I get what you mean, keep in mind that the spring will flatten out under load thus raising your spindle height relative to the frame. 11" unloaded doesn't sound all that bad, but that also depends on what you're trying to accomplish. If you're trying to get the center part of the chassis, and thus the body, closer to the ground, then Z-ing the front would do that. If you're just going for overall useable low, raked to the front, you're pretty close now. Another alternative to Z-ing the front would be to flip the suicide perch (see photo below), and mount the spring to the top. This would net you close to a 4" drop, depending on what hardware you have. Again though, be mindfull of your tie rod location. You could end up with the frame in the way. Total Performance, you see their T bucket ads on here, deals with that by putting the tie rod in front of the axle. I'm not too keen on that, but it doesn't bother others. You can't just reverse your spindles to accomplish this, it'll screw up the akerman, you'd have to either modify yours by heating and bending the arms, or get a set of TP's spindles.