You say you have been caring for these Beardie's for 2 years?
Inland Bearded Dragons (pogona vitticeps) generally grow to 18 - 20"(non-german giants) as adults. Usually a 6 - 7" Dragon is about 2 months old. Dragons generally are mostly full grown 18" in one year and then slowly get a little longer over the next year or so.
6-7" is small even for a Lawson's Dragon (aka incorrectly Rankins Dragon or Pogona Brevis)
Well anyway, Don't guess at the basking spot temp. You need a digital thermometer with a separate probe. The basking spot should be 105. UVB bulbs should be changed every 6 months.
Kale and Spinach are bad for Dragons since they contain too much Calcium binding oxalates. The link below has a good easy to understand format for what is the best dragon food. I feed Collard, Mustard, Turnip Greens, Dandelion, escarole and endive as greens. Peas, beans, squash, zucchini, and peppers as vegitables. Apple, raspberry, mango, and papaya as fruits.
http://www.beautifuldragons.503xtreme.com/Nutrition.html
I feel a powdered calcium supplement provides more calcium than the spray. I'd recommend the Rep-Cal Ultrafine Calcium with D3 (This calcium has no Vitamin A or Phosphorus) Rep-Cal also makes a good powdered multi-vitamin (again has no Vitamin A) Too much Vitamin A is bad for dragons so just check that your multi-Vitamin contains little or none. The Vitamin A to D in a multi-vitamin should be no higher than 10:1.
I feel that if your dragons are truly that small then they must be calcium deficient. This could cause their lack of coordination but so could Hypothiaminosis if you freeze your vegitables prior to feeding. I would recommend you see a reptile vet, they can detemine if there is an imbalance that has caused the lack of growth and coordination. http://www.arav.com/USMembers.htm