time to multitable?

[Bronstein]

I'm wondering whether I'm ready to multitable, so here goes...

I played 1000 hands at Party 0.5/1$ limit.
My stats are as follows:
VPIP: 18%
VPIP from SB: 43%
SFAH: 26%
PFR: 6%
W$WSF: 25%
WSD: 31%
W$SD: 59%
AF: 1.22
winning 3.85 BB / 100 hands

I know 1000 hands is very little to draw any conclusions, but what I derived from my stats was:
- I play too loose pre-flop in the SB
- I play too tight in the other positions (PFR is only 6%)
- I should raise/bet more on flop and turn (instead of calling) (AF is only 1.22)
And finally the question: do you think I can safely multitable to 2 (or even 4?) tables? What win-rate can I expect?
Thanks for your time (and advice).