Reply to Shure M447 Cartridge Trouble

Hi guys,

recently I bought a set of Shure M447 cartridges & needles for my Stanton St-150's. I looked on the internet and they were recommended a lot, so I thought it would be a good purchase. However, after I've hooked them up to my turntables, I noticed that they skip frequently, a lot more than my other needle, which is from Ortofon. I already let them break in for a while and I installed according to the manual that came with them. Am I doing something wrong, are these needlse not compatible with Stanton turntables? Please help me out, because I am really believeing about selling them and buying me some Ortofons.