If you want to move into high performance single seaters, your
options will be somewhat restricted, but you'll manage to find
something. Its typical for Euro gliders to come out of the factory
with a max cockpit load of 242 lbs (110 kg.), but that often gets
reduced when extra equipment is installed.

Most high performance gliders have provision to store ballast in the tail.
This could increase the minimum cockpit weight. You will have to reduce the
water ballast accordingly to stay below gross weight.