Curve fitting for Raman Spectrum

I am a Student working first time working on Fityk software for curve fitting . We are trying curve fitting of Raman Spectrum using this software so far we have done that using the auto-add ( Lorentzian 15% & Guassian 15%) starting fitting option in the menu bar, and have reached . We have got okay results comparing to the published articles. I have attached one of the sample spectrum. And exactly what we want. The picture attached is what we are looking for and text file needs to be used. So, 1)deconvolution of complex Raman spectra 2) We are trying to adjust the height the highest peak on spectrum , lower the height down so that the smaller peaks can be easily. 3) shift x-axis data points by some units for example we would like to shift one of the sample spectrum by 6cm-1