Sounds to me like you have a partial blockage in the nozzle, hence it is creating back pressure and you have to get the PLA hotter to push it through. Try clearing it with a pin or if that fails you can burn the plastic out by holding the brass nozzle in a gas flame. Don't overdo it though, a gas flame can melt brass. This ties in with you having to up the feed rate, as the back pressure is causing slight extruder slip.
An alternative possiblity is the filament is thicker toward the end of the reel (more than about 3.05mm dia) and is binding in the bowden tube. Can you feed it through by hand OK?
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illuminarti 18
Hi! Welcome! Are you printing the same models, or something different? Really it would be useful to see some pictures to get a sense of what the problems are that you're trying to overcome. It really all depends on the problems: Changing the temp and or speed may just be masking problems that have developed for other reasons, rather than directly solving the problems.
Its possible that the PLA is behaving differently later on the spool. Certainly if the thickness changed, that might affect things, or even the chemical composition might have changed slightly across the spool.
Another possibility is that as your printer has bedded in, something has changed about the material feeder, and it's not feeding quite as well as it was.
Or perhaps your belts have loosened a little, leading to backlash, which can affect the finish quality and even the apparent extrusion rate.
When you talk about %fr - are you referring to the speed adjustment on the Ulticontroller? That's just affecting how fast the head moves. A 10% change in that is unlikely to make much difference there, and in general, slower is going to give better results than faster.
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