[DIYbio] How important is it for primers to have 40-60% GC content?

I am writing a protocol for a DIYBio project in which we will isolate DNA, amplify it with PCR, and measure the product length with gel electrophoresis. The product we are isolating will contain a VNTR where each person's DNA is expected to contain a different number of repeats (1-10 repeats of a 48 base pair sequence), and the point of the experiment, besides learning the techniques, is for each person to discover how many copies of the repeating region they have. So I'm trying to design primers which flank the repeating sequence. Due to the constraints of primer design, I was expecting that there would be a buffer to the left and right of the sequence but what I'm finding is that the buffer is much larger than I imagined, so large that it might be difficult to distinguish 48 base pair differences.

I did find some primers that have a "buffer" of only 167 base pairs, so I can run it next to a 100 bp ladder and it will be fairly easy to visualize (max size - a sample with 10 repeats - will be 647 bp). The problem is that the reverse primer has a GC content of 66.67%. What I'm reading online says to try to aim for 40-60%. So my question, for someone with more PCR experience than me (none) - how likely is it that this primer will work? Is there anything I can do to compensate for it (raise the temperature)? I can provide more detail if needed.

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