your way sounds a lot easier than full on GAPS! 
ds1 is 9 and has no specific dx, but AS/ ASD/ ODD/ ADHD have all been pondered by various profs at various times. his main issue is continence (ignoring the sensory/ oppositional stuff for now) and i've been convinced for some time that somehow the digestive/ continence issue are linked with his less tangible quirks...
we have a paed appt next week (new paed. the last one told us it was perfectly normal for a 9yo to soil and wet himself. when i say told 'us', i mean told dh, because he took him to that particular appt. and then discharged him. it nearly caused a divorce.) that paed originally dx ds1 with encopresis and we started a six month routine designed to unblock him. it had no effect on his soiling. he's been on various meds for continence, none worked. currently he wets about 4 or 5 times a week and the soiling is variable - sometimes 6 times a week, sometimes only 2. we haven't been able to identify any particular triggers though. he sits on the toilet after breakfast and after dinner, and is productive both times - sometimes i wonder if it is more of an overactive bowel thing!!
historically, ds1 is a prime candidate for GAPS - he contracted double pneumonia courtesy of RSV at 11 weeks, and was whacked full of anti-biotics. then spent the next 3 years or so on various antibiotics for chest and ear infections. in terms of natural gut flora, i'd say it was probably toasted early on.
then he lived on watermelon and cheese for Some Time.
these days his diet is more varied, but i've been reluctant to actually get on with the GAPS diet as he does have some self imposed food restrictions... and we've had a lot of changes - his dad moved out to start a new job, and eventually we all moved house/ school etc, so he is just getting settled.
it's getting to be a pretty good time to think about it more definitely though. i'm going to ask the new paed about sunderland testing on tues. in theory he was coeliac tested before, but we were never given any definitive result.
there ya go. i started talking about pooh. feel free to carry on the motion
and i expect silverfrog (who is Very Lovely) to turn up imminently. 