Having an uneven number of them will only confuse the Wiimote...
You should have a VERY large (over 20cm) gap between 2 sets (or singles but the light can be a little weak) of IR LEDs. The SFH485P's you mentioned work great. Try putting them in this arrangement though:
o-o--------------------o-o
2 per side should be thought of as a minumum, in the real sensor bar there's 5 on each side, fanned out slightly to allow the Wiimote to see them at any angle.
You should have a VERY large (over 20cm) gap between 2 sets (or singles but the light can be a little weak) of IR LEDs. The SFH485P's you mentioned work great. Try putting them in this arrangement though:
o-o--------------------o-o
2 per side should be thought of as a minumum, in the real sensor bar there's 5 on each side, fanned out slightly to allow the Wiimote to see them at any angle.

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