Other than the Theologian archetype are there any feats or traits that allow you to increased you effective level for your clerical domain powers (or the first level power)?
Any help would be most appreciated, if anyone has any thoughts on this.
Probably more of an advice question, but yes, there are other ways to increase your effective cleric level. Off the top of my head, some of the genie-kin races(ifrit, undine, oread, sylph) have an ability called "X" affinity, where X is the name of an elemental domain. Some other races also have variant racial traits that give a bonus to cleric level for a particular domain(Vishkanyas get the Scalykind domain, Dwarves get Earth). I also believe there is a faith trait where 1/day you use your domain powers/spells at +1 cleric level, but I do not know the name.