I've got an axial scorpion RTC and am new to crawling and am trying to make the improvements that make the biggest difference.

So far I've replaced the stock ESC as it had no drag brake (used a tekin FX-R)
Ivented the rims and added wheel weight.
Those couple of changes have made a big difference.

Next on the list is behind the axle steering with axial's kit - the tie rod on the RTC is plastic and flexes and Iwant to get the battery off the high tray and this also gets more clearance than just higher knuckles and for a total cost of $43 just seemed the best bang for the buck. I've also got high clearance links fomring for the rear.

Iplan to go 3S lipo (a costly upgrade for a couple of batts and a charger) but to prepare Ihave some integy driveshafts coming. I'll likely regear once iget the battery setup. And a hi torque servo is on the eventual list as well.

So...tires I hear make a bid difference. Other than seeing what folks run at the local course (real rock set up inside a basement) what works well?

I've read bits about reducing the amount of articulation as being a good thing?Why would that be?
I've read bits about going 4 link, perhaps just in the rear over the stock 3 link. What's the advantage of this?
I've read bits about overdriving the front axle and understand why it's done - how big a difference does it make and are there any tradeoffs?