Water base works better and goes deeper into the lam (Troy Breading told me that, he dyed lots of lams). For bamboo like Roy I would use alcohol based.
I think the wood is curly Myrtle but its way to heavy.
I did not worry about grain raising.
I use paper towels in between the lams to dry them
pull off 36", fold it long ways 2 times ( do this for all 4 lams), stack all 4 of them up with the towels in between with a weight (long piece of bow wood) on top so they don't warp.
I have a dehumidifier in my bow shop.
I weight my lams before and after so they would be dry, only took a couple days in my bow shop or you can glue them to your core lams before the dye is put on.