I apologize for not having my signature filled out, I will rectify that. I don't post here often.
Correct me if I am wrong, but you said you wash the deck and then assist in drying the surface with some type of blower? I'm sorry, but if you are a wood professional you would already know that sealing wood above 15% mositure content (as determined by a moisture meter) will set you up for premature finish failure. Trust me, blower or not, no deck will dry out enough to be sealed in 30 minutes. Also, Olympic Waterguard is not a quality product. It has no UV protection and goes for under $9/gallon. Again being a professional you would realize this from experience. The products I use range from $25-40 per gallon and are not available at Lowe's or Home Depot.
In final, you read the latter posts for what people charge for this type of job. Does that not leave you as a lowballer, killing other contractors? What chemicals do you use to clean? I have everything neccessary for state of the art cleaning including two 5 gpm machines, HVLP sprayers, Shur Flo pumps and the proper chemicals. I know how long I would take to do this job and the times you mention are borderline ridiculous.
Like I said, I'm glad you are not in my area. It's nothing against you personally, you may be a helluva guy. You just need to revisit your pricing structure and quite possibly read more posts on modern wood restoration.
Ken Fenner
PressurePros, Inc
Havertown, PA
888-855-WASH