Synology DS115j ... is it OK?

[DomieMic65]

Hi to all!
I am new here!
I discovered MinimServer almost by chance and I decided to use it on my NAS. Synology DS115j.
For upnp renderer I use a raspberry pi 3B (I have 3B+ too but it has some problems with the Ethernet/usb and I decided to go back to the trusty 3B) with Archphile software (http://www.archphile.org).
After some trial and error I managed to set up minimserver to my NAS and I am very happy with it!

Some questions:
1) is the entry level DS115j adequate for running minim server?
2) I see that flac files are reproduced without any conversion needed from minimstreamer but alac files need to be converted. I use alac:wav24.
Would it be better to use flac:wav24 too or since flacs are reproduced without issues it’s better not to convert them? The same for aiff or other types of files. If they play without converting is it better to convert or not?
3) About ddf and dsf files. Using USB connection to the DAC (M2Tech HiFace evo two plus) dsf:dopwav and ddf:dopwav works just fine.
But sometimes I use an Allo DigiOne HAT on the rpi witch is a i2s to SPDIF converter board and works up to 24/192 with no DOP capability. If I want to convert ddf or dsf to :wav24;176 in order to listen to them I get interrupted sound. Is there something wrong I am doing?

Thanks in advance and kudos toy the developer for such great software. I am planing a donation very soon!!
All the best to all!
Michael