Development only alters the contrast of the film, not the speed. More development = contrastier negatives, but there's really not much you can do by way of development to alter the real speed of a film.(posted 8494 days ago)
Without getting too technical, the speed of a film is gauged by the amount of exposure it takes to produce an image that's just visible above the base fog level. If you haven't given the film this minimum exposure, then no amount of developing will bring that lost detail out.
More development will give you more easily printed negatives from an underexposed film, but it will never give you any real extra film speed. If you need a high-speed film, then buy a high-speed film to begin with. Sorry, but that's the tough truth of it.Another tough truth is that using a squeegee will scratch your film. Sooner or later. No matter how carefully you think you've cleaned or checked those nice soft rubber blades, one day they'll pick up a piece of nasty sharp grit, and you'll drag it the length of your film. We've all been there. We've all said, "I'm too careful to let that happen to me" - famous last words. The first time you ruin an important film, that stupid squeegee goes in the bin, so save yourself the trouble and bin it now, or don't even bother to buy one.
Fit a water filter to your tap (faucet), use the very minimum amount of photoflo, and you'll find that a squeegee is totally unnecessary. Besides, drying marks can be washed off again, but scratched film is scratched forever.