I have been reviewing all the advice. With the rectangle shaped radiant stones, how close should the depth to table ratio be? (e.g. the depth is 70% and the table is 73%?). Should you avoid those ratios more than 2 or 3 apart? Should the depth be lesser than the table or vise versa? (e.g. depth 70% table 72% vs. depth 71% table 69%) Thank you once again for your help.