My 1st post

I'm new to arbing, and have learned alot from this forum over the last 2 weeks. I've been looking for arbs myself over the last 2 days and found my 1st one today in the Aussie big bash cricket which was between 2 bookies the arb was 2.9%.

My question is although I never used the arb, is this a decent one that I found or below average.?? Also can anybody give me some advise o finding manual arbs/middles, ie which bookies to look out for or is a case of using one of the arb services available ?
What % is a average arb ?
Many Thanks Guys