Leveling: I was thinking I should level up to T4 as soon as I can (even if my RR lags and I suck) since there is more population and opportunity to gain renown (more rvr and more scens)...so I will level my RR faster at that point. Is this a good plan? Or should I let my XP lag and focus on gaining renown as much as possible so I don't suck as bad when I get to T4? I don't have a ton of time to play, so I want to be somewhat efficient.
Renown points: I recently read that I should put 3 levels into parry, and the rest into str or weaponskill. This sounds OK? Should I prefer Str or WS, or balance them?
The Fight: I was advised in game that once I get to higher levels, "if you can't crit, you can't kill." How do I improve my crit %? Is it through a stat like WS or STR? Or through items or buffs?
Any other advice? I know -- get a pocket tank and healer.

Any other advice for someone who has to pug more often than not?
(don't say "don't play a slayer." I've taken my oath, and nothing will prevent me my doom).
Thanks all!