If poundage and DL is correct that speed is low. Actually that bow is a dog. With a fair release and light string silencer (like catwiskers) the average speed loss is around 4 to 6 fps compared to the same bow on a shooting machine and naked string. You could reach the 180 fps mark for 10 gpp arrow with a Hurst Prana, a Toelke Chinook or a Caribow Tuktu EX in the glass limb bow league or the 190 fps with a Border mosstrooper , a Timberghost G4 or a centaur Recurve in the carbon limb bow league.Right now shooting my Samick Discovery at 45#, 28.5 DL, 470grn arrow at a blazing 158fps.
I would have thought I would have been a bit faster.
Where speed is a concern is for hunting and broad head selection. I use the two blade Magnus Stingers but seems the ones they call four blade heads (two blade with a bleeder blade) would be a better choice. Either way, more energy is always better at lower poundage hunting bows.
On top of that I have been thinking of getting a nice looking one piece recurve and if I do I would like it to be on the faster side.
For all I know my 20 year old chrony can be off. The speeds I get don't make sense to me. Maybe it's time for a new chrony.If you take away wanting to spend hundreds of more dollars then I would (and do myself) just tune heavier arrows with 2 blade heads and live with the speed you get. 480 gr. is as low as I would even consider from a 40 pound draw weight, 450 gr. if you are actually getting 165 to 170 fps.
Nobody I shoot with has any idea how fast my arrows are going ('cept Charlie). No one has ever said, "omg Glynn those arrows sure look like they are going slow, they are just going to drop out of the sky past 20 yards." Sure there is a difference in trajectory between 150 fps and 170 fps, but when you are shooting at something at 18 yards you are not going to see it.
Know your gaps intuitively to your point-on or your arrows flight instinctively to your max range and keep your hunting shots there and below, you're going to be fine.