Paul,
Check your CG on the LS-7, bet its about 50% of allowable range. Most
standard class ships should be flown around 85%. A nose heavy ship will
require constant tugging on the pole and lead you to believe it wants
to be flown faster.

Consider adding some weight under the horizontal stab, but be sure and
remove it after your flight, so as to not give the next club pilot an
unexpected thrill. Consider adding a tail tank so each club pilot can
trim the ship to his/her weight, but once again, remember to dump the
tail tank after your flight.
Luck,
JJ