Downloading selected playlists to phone, but keeping iTunes Match functionality?

Question

I did look around for the answer to this, but found nothing that answered the question specifically. 
I have an extensive music collection by most standards.  It's about 180gb and "weeded" out to eliminate the bad songs.  I have it organized into playlists that I listen to almost exclusively, as the collection is too large to just hunt and find stuff when you just want to hear music.  I essentially do a genius playlist and save it as a new one to listen to. 
I travel a lot to places without cell service, and that is where I listen to music essentially 100% of the time.  Out on the river on a boat for example.  iTunes match is horrible for this, as I found out the first try, and had to dig out CD's to get me through the trip. 
I have paid for iTunes match, and listen to iTunes Radio primarily at the house every day streaming from the phone.  Works great.  Because of the lack of coverage though, I need to download my music onto the phone and keep it there, which has required me to shut off iTunes Match on phone.  This turns the radio into a commercial machine though.  Even though I own iTunes Match, if I don't have it enabled on the phone, it acts like I don't have it and I get commercials. Weak. 
Lastly, I have downloaded the music onto my phone, turned on iTunes Match once downloaded (someone elses solution) and it deleted it as soon as I synced my phone again
How do I download say 50gb of music onto my phone and have it not delete it as soon as it syncs again? 

Answer 1

There are two methods to get large amounts of music onto your iPhone.
1. Turn off iTunes Match, sync the music via USB, then re-enable the service. The music shouldn't actually be deleted. The service isn't supposed to work that way.
2. Download the playlist to your iPhone via Wi Fi while on your home network.