Decent Speed Infusion on a F/P Arch Mage - is it worth it?

yeup, on PB, the CD on on SI/SE allow me to have them on through 2 crashes before having to switch during the next reflect, the massive range of his 1/1 may prove annoying though, since you'll be unable to switch if you keep getting hit.

i wouldn't suggest getting the glove honestly, in your case it doesn't sound like it would provide much improvement. maybe if you could cap with the glove equipped.