Circuit Breaker Issues?

Get a second opinion, there is a problem somewhere, It could be a over load , maybe something wrong/or a short with the appliances. Also your circuit breaker will need to be strong enough for these new pieces. There's some type of issue that is doing this. This is also a safety issue. Please get someone else to check , so you can follow your business dreams!

You may need a master electrician. The one you have doesnt have the knowledge. Find someone else.

It would be wise to not turn on either of those appliances until you locate the problem or you could cause serious damage to the wiring and appliances.

If none of this was done properly (no permit) you may have problems getting another electrician to look for your problem as they may not wish to sign off on a private job.

If you or your electrician would like to ask for expert help you can try asking your question on one of these forums. You will have to join the site and be able to answer questions as to how the job was done and all about your home/garage electricity before this job began.
www.avsforum.com/.../
forum.smarthome.com/default.asp
www.diychatroom.com/.../

Your oven and the proofer should EACH be wired to their own breakers of sufficient amps, (just like refrigerators, freezers, hot water heaters, if on a well- the water pump, and any other high draw item), otherwise they will continue to pop breakers. Also, make sure the wiring coming into your house to the breaker box is of high enough amperage to serve the total home...200 amp minimum.