Give up too much speed? That' s a subjective thing you need to decide for yourself, of course, but from 430 grains to 490, you' re only talking maybe 12 fps or so. Maybe 6 fps from 460 to 490. But I think you' re right. The 2314' s will be a little fragile for ground pounding at small game.
Anyway, 400' s always seem a little weak to me, even when the chart says they' ll work on a bow. 340' s have been more consistent shooters for me. I haven' t looked at the chart for your setup, but if you' re getting near the high side for 400' s, go ahead and step up to 340.
At least, that' s what I' ve experienced with the Bemans and Easton Epics I' ve shot.
I just did a head to head comparison of the three shafts on ArchersAdvantage out of an imaginary setup.The setup was similar to what you could expect from a hard one cam cybertec.
The 2314 and the 400 were to the stiff side of perfect with spine.(practically perfect)The 340 was a little stiffer than I like but was still acceptable.If you increase poundage like you were thinking they would be better but IMO the 400 looks like an excellent choice as is.1 ft/lb of ke isn' t really that much to be scratching your head over.
Now remember these may not be EXACTLY what you will be seing but I bet the #' s are close.
I' ll give you another choice if you want the best of both worlds.Try the ACC Kinetic II' s.If the price doesn' t scare you off then I would think they would be just what you are looking for.
The Archery Program or Archers Advantage would be well worth the money.I use Archers Advantage and love it.I have yet to have a problem with getting the correct arrow THE FIRST TIME by using it.You also know exactly where the spine is for you. Knowing if a shaft is a little week or a little stiff can be a huge asset when buying those $100.00 arrows.Little week might shoot ok for a while but will shoot out much quicker than the arrow that is a little stiff.