I suppose the best next thing would be to build it and make measurements
. I will try to get hold of another program to compare. My one friend uses software by Ansoft for PSU's so maybe he can compare results.
I must say that the software I am using proved quite accurate the times I took trouble to verify the results by actual measurements. I have found a few instances where some models were too good to be true, which just again prove know what to expect and not to believe everything a spice program spits out.
What were your results with the original circuit as is?