Statistics impact on roofit?

Dear experts,

I am trying to fit some data points using a complex function. Now, I have noticed that if I take only take 0.01 times the entries , it gives a very clean fit, but if I take the whole entries then the fit becomes way worse ( chisquare 1.05 → 65.09!)

Is there anyway I can use this info to adjust the parameters( like multiplying or dividing by 100 for one of the roofit parameters)?

PFA below!
lambda_ubfit_final.C (9.8 KB)

May be @jonas can help.


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