if you dont like your focus you can buy aftermarket lenses (search for g2 lens). Diode lasers all have a line with a dot when focused. I have a 2.5 watt and can cut 3mm plywood in 6-9 passes. You need air assist and you need to have nothing under the cut lines so gas can escape underneath.
If you plan on removing material i would recommend attaching an air assist to blow at the point the laser strikes to assist in removing that material as it is heated. Settings, depth of cut, and number of passes are specific to the material, your laser power, and your setup. I recommend starting with a scrap piece and using the sample files for speed and greyscale to help you determine power and speed. They are in t2 under help.
I'm sorry you find elekscam special features "annoying". It is a free software that has not been actively developed and has not been updated for quite some time. If SVGs are coming out as nonsense well... that sucks. Suck it up and pay for a software that likes svgs and is being readily developed. You clearly do not want a work around. You want elekscam to work with the svg that it doesnt work with. That just wont happen. Sorry but dont expect a fix. I recommend you take a look at Lightburn software. Its free for the first month and I believe it supports svg. It is also under active development meaning there are fixes coming for bugs. After the first month I believe it is $30.