I am going to try to take a stab at this. I hope I am not F-ed up.
With a higher gear ratio, 1st gear will run out sooner as you implied. But, keep this in mind. The difference should be less noticeable at the lower gears because the change is just a percentage.
If with 3.23's you must shift at say 35 mph, with 4.10's it might be 32 mph. The difference is much more at the higher gears. I don't have 4.10's, so this is just an educated guess on the speed.
Also, cars with mods can generally rev a little higher as the car pulls better and rev limiters get raised. This will close the gap on the shift point.
Changing indivudual gears (and this is just a guess) I think would screw everything up. If you shift properly with the stock tranny, you should hit each gear in the power band perfectly, right?
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My Stang:
2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)
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