Alex, the answer to your question is blocking helps distribute the load on a single joist to the adjacent joists. The farther away from the concentrated load the less the other joists can help. The bounce you feel when walking on the floor is associated with the floor geometry. If you saw the subfloor between each I-Joist you basically have a T shaped cross section. How well the subfloor is attached to the I-Joist is a critical component, however the depth of the I-Joist contributes the most when it comes to floor deflection or bounce when walking on the floor. You can install an I-Joist that meets all the criteria for bending and deflection, but feels bouncy when you walk. I-Joist manufactures have figured this out and now recommend deeper I-Joists in their joists tables in their published literature. To correct this bounce after the fact requires making the I-Joists stiffer. This can be accomplished by making the web thicker and/or making the bottom flange larger. Adding blocking will likely not solve your bounce issue. Shortening the I-Joist span by adding another support wall in the basement is another solution if it fits within your floor plan. Gluing and nailing a 2x4 or 2x6 to the bottom flange can be a solution that would stiffen the I-Joist, but that may require some engineering to get it right without too much guessing or trial-and-error.
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