Clashing ties & slurs with tieWaitForNote

[Steve Lacy]

Any thoughts on avoiding these clashes without having to manually tweak all the slurs? 

http://lilybin.com/5sfp1b/1

\score{

{

 \set tieWaitForNote = ##t

c''2 \( ~ b'4 \)  c''4  

c''2  ~ b'4 \(  c''4 \)  

}

\layout{}

\midi{}

}