If the starter is spinning and the bendix is not engaging, check the bendix. KTM units used to fail as the gears started to spin on the shaft and you had to replace the bendix. That could have happened to yours if the bendix has siezed up.
The beefed up battery leads need to be done anyway as the cable thickness is just not enough to pass the current the starter needs to spin at full speed.
If the battery voltage does not drop off when the starter is spinning then I doubt that the battery is at fault.
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