According to the invention, by adjusting the ratios of (SCA1)/(SCA2) and ((SCA1)+(SCA2))/(Tr) according to the foregoing limitations, the melt flow, molecular weight distribution, solubles content, or other properties of the resulting polymer, especially MF, is a function of both SCA1 and SCA2 such that f(SCA I+SCA2) is substantially different from f(SCA1), preferably f((SCA1)+(SCA2)) differs from