I'm sorry for not having enough time to post a full review of the Wave Smash Ti. What I can share is : I've two pairs of badminton shoes - Yonex SHB92EX, Mizuno LBR and Mizuno Wave Smash Ti. Both Mizuno shoes are very comfortable (I believe I've wide feet too), much better Yonex. As I said earlier, the main problem with LBR is not sufficient cushioning, and the problem for Wave Smash Ti is its weight.
For grippy, both Mizuno shoes are good (Wave Smash Ti is better). However, if you are looking for the most grippy shoes, then Mizuno DX (or the coming Wave DX) should be better.
No experience for Wave MS and Wave Return Ti so far, but I would like to try Wave MS - as it has the benefits of shoes with Wave technology and it is also being emphasised for its light weight.
I think it is difficult for Luxis to import too many shoes from Japan, they are costly ! If you really like those shoes and they don't have stock, I guess you can ask them to ship the shoes to you later, Mr. Ng and his wife should be very helpful.