Transmission issues already.

[TXDSRIDER]

So my hawk has 300 miles on it yesterday I changed the oil so I could put in my magnetic drain plug everything went well oil looked good nothing in the screen. Put the same oil I had been using from day 1 rotella t5 15w40. Took the bike out everything seemed fine then when I went to stop I noticed I couldn't get into neutral which had never really been a problem. A while later it didn't seem to want up shift every time. I blamed it on the boots I was wearing that I had never riden in. I soon noticed I wasn't missing the shifter it just wasn't pulling up. So I parked the bike and waited until today to adjust the clutch cable. Took some slack out and it seemed better except neutral, I could only get it in neutral if the bike was off. Messed with the cable a little more and started to have some success with neutral but when I went out I was having a hard time up shifting especially past second as of my last ride I couldn't come past 2nd so I parked the bike before I did any more possible damage. Any ideas I'm still not sure if my cable is 100% adjusted right but it doesn't seem any different than before the oil change.