TiteGroup is NOT my choice for 9mm Luger. As you can see, the range from start to max is quite small, so every 0.1gn change can be significant, and the powder produces pressure spikes and the powder burns very hot
If you can't find HS6, you should be looking for Power Pistol, Silhouette, True Blue, WSF, and such.
I tend to choose powders where the range from start to max is at least 1.0gn.
I also always check several sources and start at the lowest start load I can find and work up.
Next, for plated bullets (when I used to try them), I used LEAD bullet data. So, for 9mm Luger and 115gn plated bullet, I show that the ONLY load I have is 3.9gn start and 4.3gn Max, but NRA Precision Pistol shooters have used 2.6-3.4gn for 25 yd line. My data also shows that Rainier P-RN was max at 4.0gn.
So, if I had to use TG, I would start no higher than 3.5gn and work up: say, 3.4, 3.6, 3.8, 4.0, and, maybe, 4.2gn.
Always remember that loads in a manual only tell you what they found with their components and gun, and differ quite a bit from what your gun and your mix of components produces.
Pressure signs to watch for (if only there were some that were 100% reliable):
1) compare to factory ammo of the same bullet weight (but, for a very fast for cartridge powder like TG, this may not mean much until you are way over pressure)
2) compare where cases land and where factory cases of same bullet weight lands (but, for a very fast for cartridge powder like TG, this may not mean much until you are way over pressure)
3) compare the expansion bulge about 1/4" above the extractor groove (where the web is thinning out) to what the factory ammo gives you (just a 0.001" increase in the bulge can be quite significant, so measure with micrometer and not calipers). If the case head directly above the extractor groove increase AT ALL, that is generally a sign of dangerous pressure.
4) primers will often flatten, so pay attention; however, in 9mm Luger, I have noticed flattened primers with very light loads with very light recoil that showed no other signs of "pressure." This went away with a 0.2gn increase in powder charge.