Info overload - adding weight with tubes?

[CanadaCanoe]

I'm really quite happy with my current set-up, but might want a heavier arrow.

Currently:
Carbon Express 150 arrows, three feather helical 5" fletchings and either an aluminum insert and 212 grains of broadhead (Grizzly with steel adapter) or a 100 grain brass insert and 125 grains of field point.  I launch these with a 51# @28" deflex/reflex longbow that I draw to about 46# at 26".  This yields: 536gr, 11.9gpp, 19.4%FOC (I found a fancy calculator on-line!)

I've bare shaft-tested this arrangement and now everything seems to work really well if I do my part.

The thing is, I have been reading about arrow weight, and it seems I might benefit from heavier arrows.  

1.  Do I need to add weight, or should I?  

2. If adding weight, can I just buy those tubes from 3Rivers and be done with it, or will they change everything and send me back to the starting point?  Is there a "best" way to do this?  Is there an easy way?

Thanks in advance.

[Rob W.]

If they are flying good I wouldn't change a thing. Looks like a good setup to me.


Rob

[GRINCH]

Your shooting 11.9 gpp,I wouldn't change a thing,if it works thats more than enough.

[CanadaCanoe]

Thanks guys!  That's pretty much what I wanted to hear, as I prefer going out and shooting the bow to tinkering with the equipment (actually the main reason I abandoned the compound years ago and took up the stick bow recently).  Thanks again.

[Bill Carlsen]

A straight shooting arrow is more important than arrow weight alone. A poorly flying heavy arrow will probably not out penetrate a straight shooting lighter weight one. The fact that you have a lot of weight up front, to me, is the most important.  I think your set up is just fine. My wife shoots 45# @ 26" and I have her set up with a Beman MFX 500, 27" with 200 grain Razorcaps....always gets two holes so far on bear and deer.