Brian
Others can chime in but in my experience i dont use peat at all holds water to long. coir is a new rave with a lot of plumeria growers i have tried it but i dont give it any higher marks and if you not careful some has a high salt content.
with cutting to root them you need GREAAT draining mix I mix my own for everything plumeria cuttings i use 1/3 per lite (i put it threw a screen now what i have been getting there is a LOT of dust and small to small pieces 1/3 coarse sand and small rock chips and 1/3 good good potting soil (my mix) or organic matter. i fill my pots 3/4 the way and water down. then i let stand for 2 days to drain and dry in sun for a bit Then i use a pole and make a hole in it and dip my cutting in rooting hormone and insert in hole making sure to not have on bottom of put tamp soil around it and stake it and tie it good no movement. put some where that the soil is warm and NO MORE WATER until starts to form leaves. you can use a spray bottle if it start to look like its getting to wrinkled but heat heat heat ( i read some where not over 100 deg but 80-85 for soil temps is great
dont use to big of pot unless you are gang rooting the soil will stay to wet for to long I go 1 gal pot 1 cutting or 3 gal pot 3-6 cuttings but not full of soil
gang rooting i have had best luck with
some one else can chime in also what they use
just no water barely damp when planted and wait i have had rooting take 2 weeks and had that took 3 months for some reds that is a long time longer then normal but you cant rush them
