Bill, it looks to me like everything should feel more "zippy" except for 5th gear. That is the one gear that stands out as the problem to me. Here is why I say that. Your original (stock) 3 speed final gear ratios were:
1st gear = 2.94 x 4.11 = 12.08
2nd gear = 1.68 x 4.11 = 6.90
3rd gear = 1 x 4.11 = 4.11
Since we don't know which 4 speed you had (ratio-wise), we'll ignore it, but we do know your final gear was 1:1, so your final overall ratio was 3.42 (apx 15% of an improvement from 4.11).
We do know the T5 ratios, so let's see how those compare...
1st gear = 4.03 x 3.42 = 13.78
2nd = 2.37 x 3.42 = 8.10
3rd = 1.49 x 3.42 = 5.09
4th = 1.00 x 3.42 = 3.42
5th = .76 x 3.42 = 2.59
So in comparison to your original (OEM or stock) 3 speed setup, your first through third gears are higher than I would say are ideal, but they'll make it seem like you have more power than you really do...meaning your engine will be spinning faster to achieve the same mph. You will need to shift out of first around 13~15 mph, shift to third around 24~25 mph, shift to 4th around 40 mph...and here we need to stop and think. It would be nice if your "new" 3rd gear matched your old one more closely, yes? That way your first 3 speeds would feel almost exactly like the stock 3 speed. But now the shift from 4th to 5th (with your current 5th gear ratio) is going to have you driving at 60 mph at about 1800 rpms (assuming you have a 28 inch tire) and that is apx 200~300 rpm slower than I think you need to be and will make that last gear feel sluggish.
My suggestion would be to find a .86 overdrive gear for the T5, and use it if you want to keep the T5 ratios as they are.
Or...if you want a setup which will mimic the standard gear ratio and give you two nice "overdrive" gears, swap your rear end for a 3.08 ratio (as I recall the deck height will allow you to do this with the 12 bolt you have) and swap the 5th gear for a .86 overdrive. Let's see what happens to your overall gear ratios if you did that:
1st would be 4.03 x 3.08 = 12.41
2nd would be 2.37 x 3.08 = 7.30
3rd would be 1.49 x 3.08 = 4.59
4th would be 1.00 x 3.08 = 3.08
and 5th would be .86 x 3.08 = 2.65
Now if you compare that to the stock gear ratios the GM engineers wanted that truck/engine to have, you'll see gears 1 through 3 are almost exactly the right spot. So your truck is going to feel the same and it will work just like a pickup should...especially in the hills of Taos. And when you get to 4th gear, you'll enjoy a 25% reduction in rpm...just slightly less than a typical overdrive 3 speed transmission which works fine in a pickup. Finally when you get to nice flat road (let's say driving to Roswell), fifth gear will be very nice because in fifth at 60 mph you'll be turning about 2000~2100 rpms (depending on your tire size...I'm thinking 15 inch wheels and something like 205/75R tires). And that in terms of the torque curve is in the lower portion but will work (unless you're in a bunch of wind). Good luck!
