I would do the following in this order of priority:

Better sights (I like the Dawson fiber optic front and the Heinie Slant Pro rear), 25 cent Trigger Job (i.e. polishing, find it via Google), Stainless Steel Guide Rod and reduced power spring (for minor PF reloads I use an ISMI 13lb spring), Grip Tape (either the pre cut stuff or some skate board deck tape, look a the USPSA rules for where it can be placed for production), Trigger over travel stop (either drill/tap/setscrew the stock trigger housing or buy the Lone Wolf), and a grip plug if you like.

Ideally you would do the above to a G34, but if you have a G17 start with that (that is what I did, the G17 then became my back up pistol).

my G34 and G17 are clones except for length... I started shooting IHMSA metallic silhouette so stick with fixed black sight...in the Florida sun, you don't loose elevation on long range plates... Heinie Slant pro rear, but had to go with a .280" tall Dawson front sight to get the G34 to shoot low enough (I have a Briley aftermarket barrel)... the Heinie set was point of aim/impact for the G17...don't think the Dawson adjustables were out when I set up the G17... I'm old so like a thinner .090" width sight... like Jesse, the JP extended button is one of the must have things if you have small hands (much better than the OEM).... a hardened stainless one piece guide rod, with ISMI spring ( mine is much heavier than Jesse' at 17#)... butt plug and some grip tape panels and in the thumb swells...my hand size doesn't require the extended beavertail...I shoot Limited minor, so don't use a mag well... there is a slight taper on the butt plug...

my best suggestion is to try and find an accurate load....147grain bullets shoot better than other weights for me... I shoot Precision Delta 147s, Win Super Field, at about 1000fps...

What is the extended beaver tail for?

Already has a reduction to the trigger guard, competition spring kit, I polished all metal surfaces (.25 trigger job style), 3.5# connector, and Dawson fixed front/adjustable rear sights.

Just placed an order and I am dropping in a complete fulcrum trigger, tungsten guide rod with 15# spring (hoping it won't be an issue suppressed), extended slide release, extended mag release, skeletonized striker, and CR Speed belt.

Hoping the upgrades make a good amount of difference. Trigger pull wasn't horrible, but seemed long and I wanted the reset on the trigger to be shorter for faster shots.

I have never shot USPSA and have so far shot 3 3-gun matches (2 local CMMG mathes and MW3G)....but shoot alot on my personal range.

Right now, I am running some Kydex holsters and mag holders we made at my office.

My hands broad, but not like Tischauers catchers mitts.

I'll have to see how the guide rod is, I may end up taking it out of I don't like it.

I have 7-8000 rounds through this pistol, so I'm not worried about that part so much as shortening the pull and reset. I need to work on transitioning from target to target, trusting my shot, instead of waitin to see a hole in paper or steel to fall before moving to the next target. I don't miss often, but I tend to shoot, watch, see the target fall, then move to the next target. I watched several shooters last week that missed ALOT when shooting a plate rack, but were alot faster me even though they shot 20 times at 10 plates and I shot 10-11 times at 10 plates. I can seem to do it with a shotgun (lotta bird hunting and skeet shooting), but with rifle and pistol I feel like I'm still treating it as an accuracy competition I guess.

I think you posted the wrong photo - that gun is NOT legal for USPSA Production. The beavertail, grip tape on the slide, extended mag release, mag well and any significant reshaping of the grip are a problem. Turn up on my stage with that gun and you will be shooting Open.

That is his 3 Gun 34. The one below it is modded for USPSA.