Fotospeed LD20
Moersch Easylith
Rollei Lith developer
I suspect they all work. Just get the cheapest and most available. Lith-printing will hide any base fog on this paper which is somewhat old by now, and let you get to Dmax. I think it would lith quite beautifully. If you need to read up on lith printing you can go to the website of Wolfgang Moersch or surch for publications by Tim Rudman. The last is the uncrowned king of lith printing. He also wrote the definitive book about it. Good luck.
P.S. You write that you cannot get enough contrast. Is that due to the paper being fogged?