This is strictly anecdotal, and I offer it only as my own tobacco experience:
When I first started vaping (2012), a tobacco flavor made sense to me, so I tried a couple of house-label e-liquids my local B&M shop sold. I was expecting them to taste similar to a burning cigarette... and they tasted nothing like that to me. To make matters worse, even though I found nothing "tobacco like" about them; they were the one flavor group that actually made me jones for a cigarette!
Needless to say, I wrote tobacco vapes off as "not for me," very early. Now fast forward to last year.
I was getting burnt out on fruits, and mints. I just couldn't manage to dial in the few bakeries I tried. Custards and cheesecakes just didn't work. And, I didn't have a clue what I wanted to mix.
I had been following Danny's tobacco thread (as I follow all DIY threads); and some of the descriptions gave me the hankering to give them another go.So, I chose a few, that sounded like they might work for me, and gave them a shot.
I don't know, if it was due to my changing taste buds, or enough time passing to allow me to forget what an actual cigarette really tastes like. But, I found I now enjoyed some tobacco flavors. They still taste nothing like burning tobacco to me. Rather, I find the flavor to be more reminiscent of the aroma of fresh/un-burned tobacco. Also, they no longer seemed to make me crave the real thing.
Cigarette-styled tobacco concentrates tend to remind be of the way a freshly opened pack of smokes smelled. Pipe-styled tobacco concentrates remind me more of wicking my nose into a pipe tobacco pouch (more aromatic). I have yet to find a cigar-type that makes me think "this is cigar," but I keep trying.
I share all that,
@NatashaTMT, only so you know what tobaccos taste like, to
me. You, and/or others, may have totally different experiences using tobacco. Maybe, it will give you yet another way to evaluate tobacco vapes, as you decide whether tobaccos might be for you, or not.
All that as
my starting point; as I look at your recipe, these I my thoughts. Please keep in mind, I have not tried the mix, so I am strictly shooting from the hip (guessing

).
I had the opposite idea of dobroeutro; and would suggest lowering the HS Desert Ship. I am vaping it, as a stand-alone flavor, as I type this out. And, at only 3.5%, in a single coil tight drawing MTL tank, I find it flavorful, but maybe a smidge weak. I think 4% might be ideal for my current set-up.
Because you are sub-ohming; I am not sure you would need to go that high. Hangsen tobaccos tend to be pretty potent (based on what I have been able to read). 3-4% looks like the "normal(?)" range as a single flavor. Of course, I don't have any idea how the other flavors, of your proposed recipe, may "sit" on the tobacco. It doesn't look outrageous to me; maybe just a little high.
I am not sure about the marshmallow in a tobacco recipe. But, just because I haven't heard of it, or tried it; doesn't mean it can't work.

Be sure to share your findings!
The rest of it looks good; let us know how it works out!