You may find one good stick of Ramin out of 10 inspected, probably not. Speaking as a primitive/Traditional archer, I've made many arrows out of other than Port Orford Cedar, and a few self bows out of other than Osage Orange. Ramin is the lower end of the frindge.
Now, speaking of ramrods...Hickory is the best choice due to practicality and availability. Red Elm, hackberry, Ash, Oak also will make a decent Ramrod. I prefer Hickory, splitting my own out of staves.
When I follow the grain, which is reasonably straight, I get no runout on the finished rod except for the "swell" that I like to put on one end. Any crookedness is removed with a heat gun and a pair of cotten gloves by counter bending against the bend. It ain't rocket science.
Cheers,
R