<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">What to do? </div></BLOCKQUOTE>
If it was me, I'd do an extra butt (over and above what you had originally planned on) with the injection and do a side-by-side comparison. This way if it flops, no big deal as you've got the original, if it's a success, then you can see how it compares. Best of both worlds!