it seems like you're creating too much foam, introducing too much air in the beginning. Its perfect for a dry cappuccino but fail for latte art. Shorten your 'part 1', then concentrate more on swirling the milk. It'll be better for tiger to advise you since he own a silvia.
Of all the latte art videos I've seen, this is the best one. Very clear and easy to understand, esp for noobs.
VCR StreetSmarts #14: Latte Art on Vimeo
Some methods advocate 2 stage of milk frothing ie. 1) sucking of air into milk, wand just below surface until milk is about 40 degree and 2)plunging wand deeper into milk until milk is about 65 degrees while ensuring the milk is moving in a way that the milk and bubbles are being "folded".
There can be many reasons why the foam is stiff
1) doing stage 1 for too long (into too much air into milk)
2) doing stage 2 incorrectly (not folding the milk over itself i.e. swirling correctly and sufficiently to mix the air as homogeneously as possible into the whole milk mixture)
I find stage 2 is the hardest to do because you need to know where to place your wand and angle to create a nice folding movement of the milk and also you need the steam power in your machine to be enough. Too little power and the milk will not mix well, too much power and instead of creating a nice consistent swirl to fold itself your milk will just be bubbling all over.
if you are using a small pitcher (which i recommend for silvia because of the steam power). fill the milk to half or slightly less than half. Introduce air into the mix (Stage 1) for only about 4-6 seconds (or when milk gets very slightly warm) by putting the tip just under surface. then plunge inside and angle your wand correctly to create the folding action. once its uncomfortable to touch, your milk is done.
The milk must be good too. use full cream pura or green fields. The milk must be very cold to give you more time to froth. . Seems to work for me. Low fat foams easiest but the foam is stiff.
If you don't want to waste milk but need the practice then fill the pitcher with ice cold water and add a very tiny "smudge" of dishwashing soap to the ice water. Use this method to confirm which position of the wand and angle you need to do stage 2. End result you should get small bubbles instead of large one. If you can post video it would help too.
Try not to do stage 1 for too long. If not sure plunge inside for stage 2 earlier than later is better.
Just need to practice. I find my silvia is actually easier to steam small quantities compared to the vbm double boiler so don't give up.