Trex Gapping problems

I built a Trex deck about 4 years ago as did one ofg my friends who is a contractor. We now find that the boards have swelled such that the gap between them has narrowed excessively to the point where the gap has to be restored. First, I wish Trex had suggested in their instructions a larger gap but in any case, I think I'm going to try and make a jig with a 1/4" router bit riding on a router base modification made so the router will follow the groove between the boards. Then make another pass with a jig that rides in the 1/4" groove just cut for the rounding over part. 2 Questions....has anyone encountered this with trex and might there possibly be a bit out there that custs the slot and rounds over in one shot?
Incidentally, NOTHING takes to routing better than Trex!!
Ray
(to respond via email, take out "the garbage")
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Can't offer you any advice, but a friend had a similar problem but also his Trex developed a fungus/mold problem. Your idea makes sense, but have you tried contacting Trex customer assistance?

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<< Subject: Re: Trex Gapping problems From: "Louis McEniry" snipped-for-privacy@trirfoods.co >>
<< but also his Trex developed a fungus/mold problem. >>
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Would this friend happen to have email so that he/her and I could compare notes on this? I believe this is what is happening to my Trex deck. Olympic Deck Cleaner and power washing will make it look better for a couple of days, but it quickly returns.
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Maybe you could first do a slot with a saw and then rout with a v-tip or roundover bit you already have?
http://www.woodbits.com/ has some good bits for the money if you need a new one. Lower cost than big brands, similar quality. (I own 90% CMT router bits [around 30] and the rest are 90% Woodline.) You might especially look at their Plunging Roundover bit, WL-1053-P is the 1-3/16" cutting length one, page 6 in the catalog. It sounds like what you want. Their web site is crude but the bits and prices are pretty good. Fast shipping too. (No connection, I'm just a customer.)

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