chemfig: bonds shifting downward after subscripts

Question

I am trying to use chemfig package, and some bonds seem to slip lower.  I want all bonds to be the same height (of course?).  There is a similar issue posted 2 years ago, and I have included the solution, but since I don't want the extra atom in front of the bond, I don't know what to do.
I want C_{italics{sp}^3}-H.
Here's the code.  Suggestions much appreciated.
documentclass[11pt, oneside]{article}
usepackage{geometry}
geometry{letterpaper}
usepackage{graphicx}
usepackage{chemfig}
usepackage{amssymb}

begin{document}

begin{enumerate}
    item chemfig{Ctextsubscript{textit{sp}textsuperscript{3}}-H} bond
    item chemfig{Ctextsubscript{textit{sp}textsuperscript{3}}{-}H} bond
    item chemfig{C_{textit{sp}^3}C(-H)}
    item chemfig{C_{textit{sp}^3}(-H)}
end{enumerate}

end{document}

Here is a hand-drawn image of what I'm trying to do, per request of js

Edson Marcon · Answer

Try this
documentclass[11pt, oneside]{article}
usepackage{geometry}
geometry{letterpaper}
usepackage{graphicx}
usepackage{chemfig}
usepackage{amssymb}

begin{document}
        setbondoffset{14pt}
    begin{enumerate}
        item chemfig{C(hspace{20pt}_{textit{sp}^3})-#(,0pt)H}
    end{enumerate}

end{document}

js bibra · Answer

Taking into account the suggestion+1 given by @cgnieder -- from page 30 of the documentation -- http://mirrors.ctan.org/macros/generic/chemfig/chemfig-en.pdf#30

documentclass[11pt, oneside]{article}
usepackage{geometry}
geometry{letterpaper}
usepackage{graphicx}
usepackage{chemfig}
usepackage{amssymb}

begin{document}
    definesubmolI{vphantom{X}}
    begin{enumerate}
        item chemfig{Ctextsubscript{textit{sp}textsuperscript{3}}-H} bond
        item chemfig{Ctextsubscript{textit{sp}textsuperscript{3}}{-}H} bond
        item chemfig{C_{textit{sp}^3}C(-H)}
        item chemfig{C_{textit{sp}^3}|!I(-H)}
    end{enumerate}
    
end{document}

chemfig: bonds shifting downward after subscripts

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