Laura,
I think staying at 1.5 for now is a good idea. You can see how low Junior can go from that dose, so it is definitely is something to keep an eye on when you have a chance to check around nadir time. If he goes any lower in the middle, you might even need to back down to 1.25 or so. What we hope is that he'll get used to the low numbers and not react with high bounces every time. Then his PS numbers will come down to pinks or yellows and the nadirs might be blues. That is easier on his system than starting red, dropping to green, and flying back up to red again.
Carl
sorry. must be close to bed time...i got the names backwards and had to fix 'em!