I used the config_HD5300_5500_6000.plist. Since it would not boot to installer I had to make changes (KernelKextAndPatches -> DELLSMBIOS -> YES and ACPI -> DSDT -> PATCHES -> "change EHC1 to EH01" -> DISABLET = YES). I also changed ig-plat-form-id since 0x16260006 is not working as well. Just tried it again.
In theory I have DVMT-prealloc set to 96 mb, by using this guide:
https://yourapple.org/guide-cai-yosemite-tren-dell-vostro-14-5480-broadwell-hd5500.t330.html. I don't know how to check it, so I believe it's done.
Should I try to disable framebuffer patches for 32MB DVMT pre-alloc?
I've read these. Audio I`ll try but haven't found guide there to solve graphics problems.