Covered Porch deck staining/restoration help

I'm in hot, humid, SC. I have a 300 ft wrap-around porch with a T/G non-treated 3/4" pine decking. I'm told it was called "oiled pine" when house built in 1983. It is totally covered and I have eves with gutters and gutter spouts every 20 feet which carry water away from house via 4" piping. Unfortunately, the porch has little to no pitch. I'm in a real pickle now because I've tried as best as possible to seal underside of my house and because porch foundation is contiguous with main house (only piers between main house and porch), it has a vapor barrier all the way out to outer brick wall at edge of porch and all foundation vents are sealed. I have a dehumidifier under house and continuous blower fans in vents at ends of foundation. Blowing rains/pressure washing put too much water on and seeps thru T/Gs. After every blowing rain or P/W I squeegee deck. I think I can prevent this infrequent water intrusion by using elastomeric since it is breathable and durable. However, I cannot go down to bare wood again because it's only 3/4" oiled pine and was poorly sanded once to remove Behr W/B paint (used because of impending VOC laws) applied over Thompsons water seal and stain. Then had Cabot's problem solver primer applied and coated with Cabots solid alkyd stain. After vapor barrier installed and underside sealed, advised to use SW treadplex. I can maybe deal with heavy rains by squeegeeing but anytime a pressure washer is used to clean house, too much water goes under porch. From your site it looks like there is no way to keep water from the wood, and the best thing to do would be to strip/sand down to bare wood and apply TWP 100. Unfortunately the sanders did not do such a smooth job of just removing the Behr water-based and I wonder if this 3/4 inch deck could withstand another sanding and still be thick enough to walk on. IAny advice would be appreciated regarding re-doing this decking and using the TWP100. There are almost no cracks between my T/G except near the edges where the blowing rains hit and sit.
I'd appreciate any advice on if I could use the the TWP and whart I should do to use it. And if anyone has any experience with the elastomerics, I would appreciate that a well because almost
elostomeric will work to stop h2o intrusion and still allow the wood to breathe. I don't know if any of you are near the Summerville, SC area and if so, what consulting fees are but I'd appreciate some expert advice on this--I do not sleep because I've totally sealed underside and roof yet this problem remains a sword of Democles waiting to ruin all the work and lose my life savings. Sorry to sound so dramatic but I would most appreciate the advice . BTW, sorry but Termite people will not allow total vapor barrier separation between main structure and deck. Again, sorry for the long message, but I would appreciate a response.