Nothing related directly to the Ashanti wars but perhaps my experience with the WO32/ files relating to VC awards might help a bit. Of course, I have used the slightly earlier and probably much more numerous files relating to the 'Mutiny'/Rebellion, but I believe that things hadn't changed that much.
1. If at all possible get to the NA and consult the files themselves, they were written before the era of typewriting and many have barely legible script in an array of handwriting styles. Copies, as I've found with photos I took there for later consultation at home (thank goodness they allow you to do that), can be extra difficult to read, the originals are bad enough.
2. Access to the originals can present you with surprises and unexpected information or clues for further searching, which might be missed by someone copying strictly from an order sent by you. For instance, looking for someone else, I came across the recommendation for Gunpat Rao, the first Indian recommended. He was refused a VC not, as is usually assumed/stated, on any racist grounds or because of War Office resistance to rewarding 'natives' but because the War Office felt it necessary to defer to an objection from the Governor General's Office in Calcutta, apparently on the spurious (as London pointed out) grounds that there was no reason for him to get a VC as the EIC's 'native' troops' already had their own medal for gallantry, the IOM.
3. The file titles don't always tell you the full story of who is mentioned. It took me a number of visits and searches before I found the WO32/ file relating to the VC process for Henry George (Gore)-Browne. His name does not occur on the file title in the catalogue. I'm still looking for the WO32/file for Jacob Thomas V.C.. There may well be mention of those initially recommended for a V.C. who were not considered quite worthy of it but were recommended for a 'lesser award'.
4. Most files cover the whole process, which can be very short or quite extensive - initial recommendation or claim, witness reports, boards of officers recommendations,War Office memos and recommendations, Horse Guards final 'yeas' and 'nays', comments/objections/interventions and the final 'royal assent' document signed, if you're lucky, by 'Victoria'. Occasionally an unexpected snippet of information appears or a signature of 'your man', a comment in his own words and then, if you are like me, you have to stifle a tear. He actually touched, wrote or signed this, and it's the original ! In research terms I know of nothing that comes near those moments.
Hope that helps inspire you. As you live on the other side of the world from London and can perhaps only dream of spending time at the NA, welcome to the club. Fortunately they are putting more and more stuff on-line so it's a matter of holding out till the 'ammunition' gets up to the front line.
Good luck and good hunting.