we had a bad-a$$ charger too and had it all set up - but the pigs figured if they ran REALLY fast they could break thru the hot strands.Not sure why you had no oomph...
but when we put up field fence on the outside of the hot strands, they couldnt get thru the electric/fence and just stood there getting shocked.
jmh had some good thoughts about this - he helped us get it figured out. these are the only pigs we've had who've done this. after 2 days of chasing them around - and the pigs chasing the goats - we wont take the chance again.
pigs = crazy