Bob Bernardo - LA area disabled , Jun 23, 2010; 06:42 p.m.
If I was in your situation I'd go to a store or the internet and buy a light meter. Used ones are selling around $125.
Next I would set the flash units up on a 13 foot stand and take some readings using the flash meter.
If you use your on camera flash at F8 the off camera flash units shout be around F5.6. I'd also set them to manual, probably around 1/2 power. 1/32 and 1/16th are too low.