78363-48” deck Better Blades?

[stumplifter 8]

I am not getting a good cut from my deck.  Blades are new 106078’s.   Looking through other posts I see other blades that seem to have a longer cutting edge than the 2 5/8” on my current blades.  
 

So… are the blades an issue or is my deck not set properly?   I saw the Oregon Mulching blade 90-644 that looks to have more cutting length https://www.ebay.com/itm/112568896553?chn=ps&_trkparms=ispr%3D1&amdata=enc%3A124IujXJ7RFmcAbE0E_EATg59&norover=1&mkevt=1&mkrid=711-213727-13078-0&mkcid=2&itemid=112568896553&targetid=4580702891777581&device=c&mktype=&googleloc=&poi=&campaignid=418640321&mkgroupid=1233652283797640&rlsatarget=pla-4580702891777581&abcId=9300602&merchantid=51291&msclkid=9326852d18b412620fd1e1b4db77e8d9

 

appreciate any thoughts or suggestions.