Thank you everyone with your suggestions.
In retrospect my problem was that I have a large 5 foot SMB and was deploying it in shallow water 5M. I had to let go and let out line before the SMB was even half full. Even on the surface it was not nearly full.
As others have said send it up from depth and use the gas expansion in your favor. But what I have not heard anyone say is use your wing/bcd to fill your SMB. Especially if you have a bigger 5 foot SMB. I learned this trick when I started diving CCR. I think there are 4 ways to inflate and SMB but I guess its up to you to chose what works best for you. Also kind of depends on what kind of SMB you have. Personally I like the 5 foot bigger ones. I want the visibly and the flotation.
1. Oral inflate. This required you to exhale into the SMB if you have one of those little SMB's that holds almost no air then yes this works. But if you have a bigger SMB you will be trying to exhale a couple breaths into this and if will be super rushed and mess trying to to get pulled up like you said.
2. Purg your reg into it. For bigger SMB this works well but once again its mess and very very rushed and takes a little big or practice to figure out a system that works for you.
3. Using LPI hose. This system works well also same concept as the purg reg method until your practice a lot it can be little messy and very rushed
4. Using your wing/bcd.(this method only works for open bottom SMB's) This is my favorite and I don't think anyone has mentioned it nor have I ever seen OC divers use this method. When your ready to send up your SMB you it unroll clip your reel off to it hold the SMB opening above your head with one hand then you grab you wing/bcd inflator/deflator with the other and put it in the bottom open end of your SMB. Now press the deflate button with one hand while holding on to the SMB with the other and dump all the gas from your wing into your SMB. Now you have simply just transferred all the gas from your wing to you SMB you are still neutrally buoyant your not rushed your not getting pulled to the surface etc this is a very slow casual easy task. When you are ready you can casually grab your reel let go of the SMB and off it goes to the surface. The only thing is you need to remember to inflate the second you let go of your SMB since you have no gas in your wing.
The last method I described I think is the easiest and the least stressful way to send up and SMB. It is very controlled, slow, casual, and safe. This method also has many benefits if your on CC. Oral inflate is just not really an effective option, purg the reg or using LPI hose this is how I use to send up SMB's yes these 2 methods work as you could simply just use a bail out regs or an off board LPI or a dry suit LPI but once again this method is pretty rushed and seems like there is room for error to get entangled in your line and pulled to the surface, plus why waste the gas usually my bail outs are only Trimix and deco gases. This is just a really quick easy and casual way to send up an SMB. You just grab your SMB deflate into it the send it away. You don't have to mess around with pulling out bail out regs or LPI then trying to rush fill the thing and let it go really fast so it does not pull you up then deal with stuffing regs and LPI back into tank band etc.
