The QVL is qualified Vendor list, it's Not a qualified Ram list. Big difference.
Ram is manufactured by only a handful of companies worldwide, like Samsung, Nanya, SkHynix, Micron etc. They make ram for every vendor. All ram is is some silicon chiplets soldered to a pcb. With a different heatsink. Like the Chevy 350 was in an el camino, the chevelle, Camero, trucks, same idea.
The model number describes several things, F5-6000J3038F16GX2-TZ5N is your ram. Broken down;
F5 = Gskill DDR5
6000 = speed
J3038 = 30-38-38-96 timing set
F16GX2 = 16Gb x 2 (32Gb) kit
TZ5N = Heatsink identification (Trident-Z Neo)
Meaning your particular kit is identical to a F5-6000J3038F16GX2-TZ5R except that ram would have a red heatsink not the Neo. Just in DDR4, there's over 3000 different models of Trident-Z , many of which are identical, using the same Samsung or SkHynix ram, the only differences being F16GX2 might be F16GX4 and be a 4 stick kit, or be a black/silver or camo or rgb or Royal designated heatsink. Which changes the model number.
There's Zero point in Asus validating 3000 seperate models, kits, speeds, colors, Cas etc when testing 5 would do. If 6400 Cas 40 16Gb 4 stick works, everything below it will work. Same ram.
Now if you take all 3000+ gskill Trident-Z, add in the value, Rip-Jaws, Aries etc, you'd be looking at closer to 10,000 individual validated tests, just for Gskill, multiplied by the 100 or so different Vendors like Crucial, Adata, Kingston, Corsair you'd have a QVL of a million different entries, thousands on pages long, costing $millions to aquire all that ram, thousands of man-hours to test and compile, and would need to be done on all 12-15 or so different Asus motherboards in the DDR4 lineup.
Asus would go broke with every release change.
So instead, they'll test a handful of different, more popular vendors, get a decent mix of kit sizes and timings, a decent amount of SkHynix and Nanya and Micron etc tested.
In the end, you get a QVL that says 'We tested a bunch of different stuff, and it seems to work with these' and that's ALL it means. It's not a guarantee, it's not a 'only this ram' will work thing, it's not a 'until I hope Asus QVLs these unpopular and unknown Z5 Neo kits?' thing. That ram most likely Is tested, under a different model, different vendor, same ram different paint job.
You bios is doubtfully bricking. It's most likely going back through memory training after you made changes and made the ram 'worse' by changing Cas from 30 to 32. It's AM5. Expo is going to find the Optimal settings for the pc, regardless of actual Primary timings. What you aren't looking at is all 40 or so Secondary and Tertiary timings that have been tweaked for better performance, and that change to 32 now changes whether or not those 40 settings are good or not.
You are only looking at a partial picture. For instance, 3200 Cas 14 is almost identical in throughput as 3600 Cas 16 ram and faster overall than 3800 Cas 20 ram. Your timings set the speed and time for data to open the door, walk into the room, cross the room, open the other door and exit. The whole picture. A speed-walking Geisha might have the fastest feet walking of any human being, but her steps are so tiny that a teenager taking long and slow strides actually covers the same distance, faster. That's what Expo is doing. Finding the right amount of strides, right speeds, right timings for data to enter and exit the fastest, which may not always be just related to the xmp speed or Fclock/mclick/Uclock of the ram.
This is why DDR5 as yet hasn't really shown much improvement over higher speed DDR4, especially for gaming which uses lots of tiny files, the actual time it takes to enter/exit the ram is relatively close, a few nanoseconds difference at best. This happens every new DDR release, not improving until the ram matures, gets faster overall. DDR5's advantage is in bandwidth, it can shove more through at the same pace as DDR4, but for tiny files waiting on the cpu to use them, that's basically moot. A data Dam, speed it fills doesn't matter as much as how wide the flood gates are.
So let Expo do its thing, you'll not see any tangible advantages to manipulation unless you think you can out-manipulate the amd engineers who figured it all out in the first place.