Also the Concrete Contractors who build ICF in your area may be able to recommend someone familiar with ICF.
Along the lines of the prescriptive method, PCA-100, available free from the Portland Cement Association, is an excellent resource, especially if you are in a seismic zone(D1-D2) as their prescriptive tables are approved for use there(as are ACI-318 if I recall correctly).
Depending on your plan, A PE analysis may actually pay for itself in rebar cost savings over a prescriptive design, mine did... The plans also zipped right thru the building department review with the engineers stamp on them
