Our house has 5" gutters on the upper, main portion of the house. The previous owner replaced the lower roof gutters with 6" gutters, because parts of those handle more water because they get some water diverted from a downspout from the upper roof into them. The larger gutters work well. The smaller gutters on the main house roof also drain a lot of rain water, and in heavy downpours, usually overflow. Each time I go clean them, there is a collection of small sticks near the downspout, which I remove, but the bottleneck is a very small exit from the gutter to the downspout. The hole is probably not even 1.5 x 3". The downspout is 2 x 4" by my rough estimate. That means there is a much smaller hole than the downspout could accommodate. Simply enlarging the hole transition to the downspout would improve flow, and freedom from bridging. Can the exit holes be enlarged? It would appear the alternative is replacement of all the main house upper roof gutters with larger ones, which is not an attractive option due to the amount of gutter.