If you are pretty much gonna power it up no matter what...
then the one thing i do suggest you do, is wait till the end of the month to do it.
You say that most likely you wont get another...but you never know, its possible. You managed to find people to beat the raid once...so it can happen again.
And think about this....if you did manage to beat another Raikou raid within the month...then the Raikoui you have the chance to catch, is pretty much guaranteed to have better IVs than your current one...and it could have much better ones too, never mind just slightly better.
Basically, if your now has 10/11/10, if you do get the chance at another...its pretty high chances hes gonna be better than 10/11/10...and therefore a better investment for your resources.
So I say just wait and power up after they switch.
Keep your eyes out for another raid, its possible.