Hi Phil,
You did not say how thick your PWBs are, but I surmise they are thick.
Removing the thermal reliefs is likely to cause you soldering problems—they 
are there for a reason. 
For SAC soldering, you need more Cu for the via barrel walls because of the 
higher Cu dissolution rate of Cu in SAC. "100% barrel fill is desired with a 
good fillet top and bottom" implies filling with solder; besides poorer wetting, 
you really need to have the T's high enough—that is likely to cause some 
problems with your PWB resin system.

Werner



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