Re: Is two Days a week enough?
I'm going to agree with those posters that said that as long as you are training with full intent each time, you will progress at two days a week. However, I think back to my beginning days as a single man with time to burn and I pushed it up to 4 x a week because I could. So my fire burned brightly.
Nowadays with a young family and fuller work commitments my fire is smoldering at training one day a week and teaching one day a week. This fits my lifestyle and maintains my skill level.
I think the OP is answering his own question. "Is two days enough?" You are frustrated so I would suggest it isn't but you can find another outlet for training a third day. A similar martial art or solo training are options others have mentioned.
I'll echo the over-training thing as well. This can happen in any physical endeavor so be careful not to burn so brightly that you burn out.
I wish you all the best.