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Also Singer Heavy Duty 4411 with #18, and same thread, no problems getting balanced stitches on 500D and webbing. Seems its only the two relatively old machines (1960s 328K and 1950s 15-91 direct drive) that's giving me top tension issues. Both of these machines have very similar tension setups, and I think what's likely are that they need new thread take-up springs? 15-91 by all accounts should be powering through 500D no problem, but its bogging down.. I think new grease will help, and probably a lot more detailed cleaning of the old gunk in the drive system.