Too little yeast

[shine_]

I was making birdwatchers sugar shine a couple of times and I used 1 packet (100g) of live baker's yeast. It usually fermented within a week. This time I didn't want to drive to mall, so I got dry yeast from a local store (same brand). The packet was only 14g. I made a starter and mashed everything as usual. Now it's been 3 days and my mash is still at same SG as I started. It's bubbling a little, but really slow.

After doing some research I found that live:dry scales around 1:3, only on baker's forums tho, is this right ? According to that I added something like 2.5x less than usual, but still shouldn't it ferment like 2.5x slower ?

I'm planning on adding more yeast, but first I want to hear from more experienced people before I completely ruin my mash, in case if it's not already ruined.