R4 cannot change the contrast of the print to match the negative. From what I recall R 4 color paper has less ladatude than black and white paper. You may be in a situation in which the R4 color paper cannot print all the tones in the negative. Does your lab only print on auto or does the operator customize the exposure? You may want to send one negative you think has printable highlights and shadows to a custom lab just see if the lab can adjust the contrast of the paper to match your negative. If so, and you need to use the local lab due to price you may want to consider exposing for the highlights and letting the shadows fall where they may, or just accept blown highlights.