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There's a fine line between having the tip of your soldering iron tinned and a blob of solder on it. Nothing wrong with having solder on the tip and it certainly helps getting heat in to the joint. Just don't have so much that you end up accidentally depositing elsewhere on the PCB.
Edited to add: I've always used basic lead-free solder from Maplins and never had the issues you are describing.
I have now ordered a few metres of 0.7mm 60 40 solder, plus a Hakko (Japanese) brand 1.6mm tip for the iron. I don't know who makes the iron tips that Maplins sell, it may or may not be Hakko, but it's possible that the new tip will be a bit better quality, which might help. And I'll see how the 60 40 solder works out - whether I use that for the pedal pcb I don't know, but experiment seems quite useful anyhow at the moment.
Give it a try. Remember, it's not the so much the temperature that causes damage to components, it's the length of time that the components are exposed to high temperature. In, out, job's a good 'un!
I said maybe.....