Disregard last, I see that you are.
First of all, 601-280 does not apply to you. You should be looking in 140-111. RCP is only for active duty, you need to look for MYOS.
Second, I don't know if you got bad info or misinterpreted what you were told, but WLC is not a requirement to reenlist, only to reenlist with a bonus (the SRIP list is your reference).
3rd, there are other factors disqualifying you from reenlistment bonuses.
4th, the limit on extensions is 48 months, but each rule has its own criteria. See AR 140-111 table 3-3. From what I can see, you are only eligible for one of those rules.
Lastly, you need to look back at the events of 27 December 2013 before you make plans to reup or reclass.
This is a ten level task