[Q] Few questions advice please

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http://forum.xda-developers.com – Hello guys just switched to the s2 from a htc desire. I have rooted the phone successfully. I am on stock ics 4.0.4 with stock kernal (brickbug one) I have installed Titanium backup, and i wanted to know if its safe to remove system apps with it? including samsung apps? also cleaning the dalvik cache with titanium backup if its safe to do that? just want to confirm as im not sure if all types of clean operation can brick my phone? or is it only with clean operations from the stock recovery that brick the phone? Also I am experiencing really low in ear volume when talking on the phone vi (HowTos)