So I recently purchased a 2004 american standard ash (not swamp ash, this thing is heavy) strat (50th anniv) with some upgraded pickups (duncans, specifically a single spaced HB), and while the tone plugged in is nothing short of amazing, i feel that my sustain and resonance with the body is severley lacking (which i thought would not be an issue with such a solid piece of wood). Right now the action is dialed so low, i feel this is killing string vibration, buzzing is not a real problem, but i find that it does seem to kill the sustain. Also, im using 3 springs and the bridge is floating.
So i was thinking of making a few mods to this guitar, and wanted to see if you guys thought this is a reasonable approach to fix some of these issues (i understand that each guitar is unique, this is more of a sanity check)
1) Raise string height, this throws off the intonation of the guitar and messes with the tuning since the bridge is floating, i dont have a strobe tuner so i havent done this setup yet
2) Replace the stock bridge, block, and saddles with a callaham, and then put 5 springs on the back and lock the bridge down to the body, not blocking it since i still want to be able to push on the strings some, but more important to me is the sustain
This seem reasonable to do? or are there any other cheaper more effective solutions any of you have tried in the past?
oh and with the calaham replacement, is it sufficient to just get the block and saddles? and if i do will the vintage fit in the am standard?
Thanks ahead for any input.

So i was thinking of making a few mods to this guitar, and wanted to see if you guys thought this is a reasonable approach to fix some of these issues (i understand that each guitar is unique, this is more of a sanity check)
1) Raise string height, this throws off the intonation of the guitar and messes with the tuning since the bridge is floating, i dont have a strobe tuner so i havent done this setup yet
2) Replace the stock bridge, block, and saddles with a callaham, and then put 5 springs on the back and lock the bridge down to the body, not blocking it since i still want to be able to push on the strings some, but more important to me is the sustain
This seem reasonable to do? or are there any other cheaper more effective solutions any of you have tried in the past?
oh and with the calaham replacement, is it sufficient to just get the block and saddles? and if i do will the vintage fit in the am standard?
Thanks ahead for any input.