I Think Screwfix 6013's are a bit hit and miss TBH. First box I use,d when I decided to seriously practice, were OK. this second box I find a bit 'sticky' Useable, but difficult. If it had been my first box, I may have given up. Sparky, get some decent 6013's and go from there. at least you will know it's not the rods that are at fault.