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barlow is overkill if you continue using the plossl’ s, though you could use it with the 15mm for a 7.5mm equivalent for planets
in your scope try and work out the planetary magnification you can use most, eg 175x, then work back by halving this figure, 85x -1250/85 = 15mm dso eyepiece, then use your barlow for planets..then aim to get your good eyepiece around this focal length, combined with a good barlow so you are using it twice.
nb some eyepieces like the pentax xw 14 don’t work well in short reflectors as it’s distortion is aimed to complement that of a refractor. have you thought about a coma corrector?
do you need long eye relief for glasses? if you;re staring out i wouldn’t go for an ethos just yet - you could look at a 15mm luminos from celestron, or the 16mm nagler
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