If it were me, and I could cover the loan, I wouldn't care about yield - I would care about total returns.
Your question (i) as to whether you have to many holdings, and (ii) how do you get more yield are somewhat irrelevant to the SM.
All you have to concern yourself with is whether your investments pass the CRA 'sniff' test of generating income/revenue. I believe they have fully accepted equities as an investment fitting this category whether they currently payout or not (they can potetially pay dividends at some point, look at AAPL).
What I would be concerned about is whether my investments are producing the highest rate of return, yield could be 0%.
Again, this is how I would do this, and only if I could cover the loan.
Now you might be arguing (I don't fully understand), that yield producing investments allow for an acceleration of the SM, because you are constantly paying down the mortgage with the dividends, but I've never seen a comparison of whether this method is 'faster' than buying a stock, selling it, then using the profits to pay down your mortgage so that you can borrow more to repeat the cycle. I assume that, again, total returns are more advantageous.
For example,
Jan 1, 100 shares BCE = $3500, 5% yield.
Dec 31, 100 shares BCE = $3500, + $175 dividends.
5% total return (less taxes)
or as I'm suggesting.
Jan 1, 10 shares of AAPL = $3500 (give me a little slack)
Dec 31, 10 shares of AAPL = $7000
100% total return (less taxes)
On Jan 1 of the following year, you increase borrowing in example 1 by $175, in 2 by $3500.
So regarding your OP, I would use the portfolio that gave me the highest returns. I personally don't believe a yield-focused approach produces the highest rate of return over time - so I wouldn't look for higher yielding investments.


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