Hi capital, welcome to Basenotes! I too love Open by Roger & Gallet - amazing fragrance. I've never smelled Jacomo de Jacomo however it's on my 'to try' list.
One fragrance which I think you may like is Francesco Smalto Pour Homme - it's quite herbal like Open but has a great, smoky note which lasts throughout.
Another recommendation would be Gianfranco Ferre for Man - this has a similar dry, dark quality to R&G Open.
Both have very good projection & longevity so no issues there...!