I am blessed with 2 hunts booked for me this year: Aussie water Buffalo with 67# @31" high performance recurve bow with 800 grain arrow and second in Namibia for plains game Wiith same recurve but 61# @31" limbs and 680 gr arrows. This 2016 safari will be my 10th African Safari with traditional bow only. I already went in South Africa (5), Zimbabwe (2) Botswana (1) and Namibia(1). I killed there a couple or more animals as you guess.
Johandre, although in some circumstance your set up may work , you are very marginal for big plains game like mature trophy wildebeest, gemsbok, zebra, waterbuck, eland...
Let say any game in the 200+ kg class. Except kudu as it is quite easy to kill.
Some guys will tell you it is fine as they done it with light set up well under 50# at their draw length, but if you plan to hunt big stuff you will quickly get some bad time.
In 2012 I shared camp with a fine gentleman from Florida, very experienced with plenty white tail deer and feral pigs kill over years as he showed us pics. He was shooting a nice longbow from a well known bowyer in the low 50's at sub 28" DL. I remember he was shootings 2 blades classic broadheads. He was a good shot on the range and did very well on a couple of springbok and a nice kudu. He lost a mature big trophy blue wildebeest and a eland cow with very poor penetration on both despite a good shot arrow placement for both as we saw on video took in the blind. On the eland cow as I remember well, arrow seemed to fail at entrance rib in the high lung area. He was really disappointed and said if he had to come back he would work out a heavier bow.
On an Internet forum you will never hear about low # bows failure. Only wins. Try to speak with bowhunting PH in your country to hear the other side of the stories.
I hope it will work for you though.