David, 

With your driver club head speed, senior flex might not be a bad idea to consider.  The Bassara will play softer, lighter (10g), and will launch the ball higher.  Depending upon how strong the ilimia currently feels to you, I think you could consider the Bassara.  I have seen players with your club head speed fit into that ilima senior flex as well as the Bassara.  I would consider trying both of them side by side to get the best comparison. 

Cameron

1-888-TITLEIST 

David M

I just bought a 910 H 24* with the stock 'ilima 70 in regular. The combination is a little strong for my swing (80MPH driver). I am going to buy a replacement shaft but I am not sure if the 'ilima senior is significantly softer in flex or if I should go with the bassara W60.

I have the 910F 19* with Bassara A flex and the 910H 24* and 27* with Bassara R flex (all set B3).  My driver swing speed is 82 mph but my irons and hybrids are closer to 90.   I still get a nice gradual trajectory and the feel is great. 

In case TT wonders why I use A flex for woods and R flex for hybrids, it is a bit of history.  I used R flex for woods and S flex for irons before.  I swing my woods a bit slower and with a longer backswing, whereas my hybrid and iron swing is a shorter backswing (still generates a reasonable amount of clubhead speed).