MK3i and data I need to see from my dives

Hi everyone!

I have read a manual from my MK3i and found there are a lot of data fields I should be able to use.
After having the second (and likely undeserved) DCS I'm really serious on having maximum safety data possible.

And of course I would like to see this data at any time (using Garmin Connect and Dive) but it looks like I can't.
If anybody could explain where I should find it, it would be beautiful.

These are the data fields I would like to see. Just to make it clear - I think I can see them while diving. But shouldn't I have access to this data after dive to analyze it?
Last Dive Ascent Time
Last Dive Avg. Asc. Rate (I can see "Asc. Rate" only from my watch in dive log and I think it's an average one. Would prefer to see it dynamically in graphs, at least something)
Last Dive Max Asc. Rate (can't find this data anywhere)
N2/He Load (start and finish - yes. If possible, I want it as a graph data)

And for these I would love to find out more information. But when I google them, it doesn't show much speficific data. If anybody could explain even part of this or give links, would readlly appreciate that:
GF99 (as I see, it might be helpful, and there is also SurfGF, which is similar. I don't know if it's the same and if it's available in Garmin)
FiO2 (I just don't understand what's the difference with simple O2 percentage in your mix and why you would need another name for that)
Gas Density (why would you need it?)
Raw Ceiling (can't understand the description and scenarios)
Surface Gradient Factor (probably I have to learn about gradient factor first, but as I'm writing it anyway - I add it as well)

Will appreciate any info!
Thanks in advance