This is what I do for the soups to minimise the froth! Cus I hate it too, but I hate lumps even more...
Put 250ml boiling water in a plastic jug, add all the powder and hand blend till I'm 100% sure all the lumps are gone (the blender was £8 from Morrison's and works just fine!), then I put the jug in the microwave for a minute and gently stir it afterwards. It still leaves some bubbles, but I find it gets rid of most of the frothy crap on top.
Just to add.... I ordered some pasta to replace the tomato soups. I've had 2 and I think I'd rather slap myself in the face, than have another! Yuckkkk!
I add half a tsp of bouillon to the Thai chicken soup and veggie one, and a cheeky tsp of chicken bovril to the mushroom one to make it more like chicken and mushroom soup. Careful though! Bouillon is fine to have but although the bovril has just 16 cals per spoon, it contains 2g of carbs (naughty!) And a lot of salt. For this reason, I try to drink more water on my musroom soup days. I don't reccomend it, but it's one of my 2 cheats on this diet. The other is a tiny splash of skimmed milk in my morning coffee. Do what works for you, and as long as you're sensible, and happy with the rate of your loss, that's all that matters x