Have just been reading through this post and plunket smunket - at least him having a gain will stop them pestering you. My little girl didnt gain for about a month after starting solids, and then again once she was on the move and then again once walking.
The important thing is he isnt loosing loads and isnt refusing food and isnt sickly with it in any other way. I have a sick child and i have had plunket tell me all sorts of rubbish, including she shouldnt be going to bed until 8pm and that its ok to add salt to her food (she has a heart condition!)
He looks a very well babe to me and good on you mum for making him that way
Keep up the good work if whatever your doing works for both of you