I remember one post where a couple of people was testing the obmh and Haseo stated that all the increases work, except for CL, so CR works fine, but dont expetc a increase in CL. Maybe someone should test again.
@kasumidoll: About the gear, spellflow i find it very useful tbh, even then the SP consume is not overwhelming and you can sustain it with soul drain, i guess at the end, check the advice people give you here and then decide yourself, most of the gear people will agree, but other goes down to preferences, either using 2h or 1h staves, or using spellflow vs orleans/phen, i prefer spellflow because free my armor slot for other things, but before that i use orleans all the time and i have an old set of elemental ones...as i said before increasing you matk is important but dont forget that on pvm or leveling is not that important if doesnt make a huge difference, like two shot to one shot a specific mob. Some people will recomend you super expensive stuff bec ause is what they have access, some other will reccomend you things they have tried, etc. At the end is up to you.
Also a lot of advices goes for expensive gear and thats cool, but there are itemes that allow you to fulfill very specific tasks aswell, crimson set is a very cheap alternative for CR leveling and is pretty ok, i one shot scarabas with a double entomic (like cory reccomend, and i think he favor a lot those sets because i think i tried it because i read a post of him xD, dont recall) and frogg hat, so is nice to have, but dont having a shiled will give you some troubles at first