Producing polyolefin products

A method of polymerizing olefins, comprising:

• contacting ethylene and at least one comonomer with a catalyst system to produce a polyolefin polymer that is multimodal, the catalyst system comprising a first catalyst that promotes polymerization of the ethylene into a low molecular weight (LMW) portion of the polyolefin polymer, and a second catalyst that promotes polymerization of the ethylene into a high molecular weight (HMW) portion of the polyolefin polymer;
• wherein the first catalyst and at least a portion of the second catalyst are co-supported to form a commonly-supported catalyst system;
• and
• wherein at least a portion of the second catalyst is added as a catalyst trim feed to the catalyst system, wherein a molar amount of the second catalyst added via the catalyst trim feed per gram of a dry commonly-supported catalyst system ranges from 1.8 μmol to 150 μmol, wherein the first catalyst comprises di(1-ethylindenyl) zirconium dimethyl having at least one of the following structures:
• or di(1-ethylindenyl) zirconium dichloride having one of the structures above except that the Me is replaced by Cl, and wherein the second catalyst comprises bis(n-propylcyclopentadienyl) hafnium dimethyl having the following structure: