Late to the party.
I had an '05 LGT 5 speed. Random stream-of-consciousness memories:
I tuned it to "Stage 2" at 18K miles, and sold it 4 years ago at 153K with the original turbo still working fine. The buyer was the son of a friend of mine. He still has it. Had to finally replace the turbo at something like 230K. Regular oil changes work! I never did the banjo bolt screen mod thingy. I checked it once and it was clean.
I totally remember the throttle lag thing. Drove my crazy.
With mine, the harder I got on it, the easier it would shift. Shifting at normal commuting speeds was clunky, but when I really needed a clean shift at high RPM, I always got one. Also, I replaced the shifter bushings with hard bushings. That's a good mod; short shifter not necessary.
The torque curve sucks in stop and go traffic - no bottom end and then too much torque. It's worse with the A/C on. Terrible commuter car for that reason.
Part of my commute involved a two-lane in the country. Coolest thing was passing someone in 5th gear at 55 and feeling the car pull harder as I accelerated. I miss the power sometimes and the AWD a lot.
Responsiveness in 5th is syrupy below 70 mph.
LCA bushings last only 40K miles or so. Hard bushings improve steering response, but use stock rubber replacements unless you really, really like NVH with double-extra H. I bought an extra pair of LCA's, changed the bushings at my leisure, and then swapped them in about 45 minutes. Lather, rinse, repeat.
A bigger rear bar was the single best mod I made - better them more power. It's an understeering pig from the factory. A bigger front bar improves turn-in response, but I had to be driving hard-ish to notice it.
They eat wheel bearings.
The brakes always felt soft and squishy. The master cylinder brace mod didn't change a thing. Different pads helped some but I never got it completely sorted.
Supposedly, the stock oil pump pickup is prone to failure. Replacing it is an awful job. Mine was perfect. Grrrr.
Just pay "your guy" to change the spark plugs. Just do it.